Home Security Help Tutorials

Tutorials that will teach you how to install products purchased from UPVC Spares 4 Repairs, or how to measure the faulty part to ensure the correct replacement part is ordered.


A. How to fit a window hinge:

This tutorial will help you change uPVC Window Hinge’s, although it is fairly straightforward careful planning is important. In some cases if the faulty window is not on the ground floor two people will be needed, one to support the window and the other to fix the window sash to the window frame.


1: Measuring The Original Window Hinge 

To be able to change your faulty window hinge you must first measure the hinge (Dim A)

Fit Window Hinge 1

(Dim A)

Measure the existing window hinge from the top corner to the end of the long bar (See Diagram Fig 1)

Please note the size when ordering a new window hinge choose a hinge that match’s the size of the original. (It is not essential that the length is exactly the same, but the lengths should be as near as possible)  Second measure the width of the hinge (Dim B) the most common width is 17-18mm however should your hinge be 15-16mm then you should choose the slimline version 

(Fig 1)

The window hinges at both sides should be replaced even if only one is faulty 

Most uPVC windows now fit window hinges with a stack height of 13mm however some of the older window frames have hinges with a stack height of 17mm.  (See Diagram fig 2)  The most common height is 13mm however should yours measure 17mm then you will need the 17mm stack height range.

(Fig 2)

2: Removing The Faulty Window Hinge 

To remove the old hinge there will normally be three screws holding the hinge to the sash and three holding the hinge to the outer frame, remove each screw (Please note if the sash is large you will need help to support the sash while you remove the screws)  (See Diagram fig 3)


3: Replacing The Window Hinge

The new window hinge should be placed against the top corner of the frame, if the original holes are not visible or do not match the new hinge don’t worry new holes can me made with the original screws.

uPVC frames have a resistance to screws similar to wood  (See Diagram Fig 4)


4: Fitting the hinge to the sash   

Fitting the hinge to the sash is the same as the outer frame but you will need to check a few things, first put the top of the hinge near to the top of the sash and attach two screws, then check to see if the window will close correctly and in the right position, you may need to alter the position of the hinge slightly higher or lower to achieve the correct positioning.  (See Diagram fig 5)





B. How to fit a door handle:

1: With the door in the open position, place one hand over the external handle and hold firmly in place. Using the correct type of screw-driver,un-tighten the fixing screws on the Internal handle set.

2: With both Internal screws loose the external handle should now be free and can be removed.

3: Once the fixing screws have been removed, the internal handle should be free to be taken off revealing both the cylinder and the 8mm spindle beneath. Screw fixing holes will also be clearly shown.

4: Remove the spindle. Using a ruler, measure the length of both the fixing screws and the spindle to ensure that the new handle contains the correct sizes. Crop if necessary. Once correct replace the spindle before proceeding.

5: Place the new external handle into the fixing holes locating them using the screw fixing lugs. The lever should be located onto the spindle at 90 degrees and should be facing away from the face of the door and back towards the door hinges. The handle will also be located over the cylinder. Repeat for the internal handle.

6: With handles both aligned correctly replace both fixing screws and finger tighten only. Test the door handle to ensure full operation can be achieved. When full operation is achieved, fully tighten the fixing screws using the screw-driver to complete the installation.



C. How to measure & choose the correct window lock mechanism.

First of all there are two types of locks Inline and Offset. Generally speaking most modern systems are fitted with the inline version as shown below. However in older systems it was common to use the Offset versions as also shown below. It is relatively easy to identify the right lock to replace your broken one by following our step by step process. Remember it does not really matter about the make of the window lock, it is more important to get the size and type right as most makes are easily interchangeable with very little effort.

Inline lock mechanisms have the gearboxes located in a central position under the faceplate.

Generally you will find that inline rods are on a flat plate (always exceptions of course!) You will find the sizes and details for these attached to our actual item parts (on-line) simply check these against yours.

Offset lock mechanisms have the gearboxes located to the edge position under the faceplate (I:E. Off centre) 

There are two types of offset rods. U-track (sometimes called c-track)
and Flat. You will find the dimensions and info for these attached to our actual item parts simply check these against yours to get the right one.


How do I measure the backset on my window lock mechanism ?

Now you have identified the type of lock rod mechanism that you are wanting to replace all you need now is to identify the
Backset dimension / Length of the lock mechanism / and finally the type of locking points you need. Below you will see the
information you need and how to quickly get it.


How do I measure the length of my window lock mechanism?

Measure the full length of the lock mechanism to identify the length you require. You will find that as a rule dimensions start at 400mm and increase in 200mm increments up-to 1200m.

End Result

By using the information in this document you will be able to identify the correct lock for your situation. It is often the case that you will find the existing manufacturer has either ceased trading or dis-continued the lock mechanism. However this is not a major problem as long as you get the in-line or offset type right and then the matching dimensions and type of lock points right. If the Lock points are found to be in a different position on the lock faceplate, All you normally need to do is re-position the keep plates (the metal plates that the lock points fasten into) which is only a matter of un-doing 1-2 screws and re- positioning them to suit the new lock.


D: How to measure a multi point door lock

1. Measure the multi point door lock using the diagram below
2. Look up a new Multipoint Door Lock lock to confirm it is the exact lock that you wish to replace.

A. Backset – The distance from the front of the faceplate to the centre of the euro hole cut out.

B. Centres – the distance from the centre of the spindle to the centre of the euro hole cut out.

C, D, E, F: Locking point distances – Measure the distance of each locking point to the centre of the spindle. Measurements are taken to the middle of the locking point but allow 5-10mm for accuracy and depending on weather the locking points are fully engaged.

Locking points:

Note which locking points your lock has and the order they are fixed to the strip, each type of locking point is shown below.



E: How to measure a PZ door handle


F: How to measure a PZ door handle


G: How to measure the size of a door barrel in the door




Measure from the centre screw hole (seen in the red circle) to the edge of handle backplate on the outside and round up the size to the next 5mm increment. E.g. 33mm would be 35mm

Doing this will ensure the cylinder protrudes from the backplate of the handle.

Now do exactly the same and measure the inside.

Note: The screw hole is the retaining screw for the lock barrel.

If you are ordering a new door handle be sure to allow for any difference in the backplate thickness.


H: How to measure the size of a door barrel out the door

I: How to identify and measure a Window Espag

Identifying a Window Espag is easy, once you know what to look for, looking at the image and information below you should easily be able to work the information required to purchase a replacement Espag.

To start with look at the centre gearbox, is it inline? or offset?

Inline Espag:

Inline Espag

Offset Espag:

Offset Espag

Now follow the simple steps below, using the diagram to assist you:

  1. Measure the backset from the centre of the spindle hole to the faceplate.
  2. The Espag length (length of window lock) is simply the measurement from one end of the espag window lock right along to the other end.
  3. Identify the locking points – Roller Cams or Mushroom Cams (see image below)

Identify Espag Diagram

The Faceplate can also be available in different sizes, be sure to measure the width of the faceplate and check if they are Flat or U-Rail.

Look at the images below to help you identify the difference between a Flat Faceplate and an U-Rail faceplate.

U-Rial or Flat Faceplate

Hopefully you should have now have all the information to identify the correct replacement Espag.

View: Our range of replacement Espags