Coldseal windows and doors were one of the largest installers within the UK in the 80's and 90's. One of their successes was due to the fact that their furniture hardware was unique to the market and because they insisted that their hardware suppliers could only offer these products to themselves exclusively. However when Coldseal ran into financial troubles in the mid 90's and ceased trading, the replacement hardware parts were made obsolete at the same time as suddenly the hardware suppliers no longer had a customer to sell them to. Over the last few years we at upvcspares4repairs have put our research and development knowledge to work to provide replacement parts and repair options to allow our customers to be able to restore their broken windows and doors. Such as the 4 hook door lock here and the Coldseal tallon window lock here.