The lock on my daughter's UPVC door is giving trouble. It's the conventional multi point type with sliding mushroom shaped pegs on the edge of the door and 'spikes' on the top and bottom.
There's no problem locking the door by moving the handle up but when you try to open it by pressing the handle down it goes through a number of very stiff clicks as the pegs slide.
The problem must be inside the mechanism rather than fouling the door frame because it does the same thing if you operate it with the door open.
I've never had to fix this type of thing before so I'm looking for a bit of background info about how easy or difficult it is to repair or replace these mechanisms.
Is it just a case of removing the handles and lock barrel then undoing all the screws down the edge of the door and will it come away easily or will all manner of bits spring out all over the floor?
If we need to replace the mechanism are they fairly standard or will I have problems locating a compatible one? And any suggestions for suitable suppliers?