How does a uPVC door mechanism work?

uPVC door mechanisms are the most important part of security in a home.
This video explains the complexities of a gearbox in an uPVC mechanism. Which I like to call the brains of the mechanism. All of its components are delicate and fragile and should never be opened. But of course I do suggest servicing all mechanisms as dirt, dust and pollution really does cause irritation and blockages. Towards the end it creates damage and leaves yourselves locked in or locked out.
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