If the uPVC door lock mechanism is sticking, the reason can be unlubricated or broken internal hinges. To find out what is making the mechanism stick, you’ll have to take it out to inspect it. However, if you’re not skilled at DIY handyman work, you should call a licensed profession...
Magnets will not stick to stainless steel. Interlockers: These are two-angle uPVC blocks which help the sash close properly and keep it tight against the seal. Plus, they also give your window better security. All window systems have these; the only reason they might not be on a window ...
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