Hi,

I've got an old sliding patio door that will be getting replaced at some point. At the moment it's locked with two bolts in the middle of the two doors that stop the door sliding. The previous owners left us no key for the multipoint lock by the handle. I've managed to change the euro cylinder on the lock now but I noticed that the handle just spins instead of engaging the bolts in the frame. Both handles spin so the spindle is fine (took handles off to confirm this). There must be something missing off the spindle that engages the bolts in the locking mechanism. Does anyone know what this is and whether you can just buy them from a hardware store?

Update:

This doesn't look like any sophisticated locking mechanism. The pic below shows the hole where the door handle was. The spindle goes through the larger hole and it looks like it just needs something on it to connect to the locking bolts/mechanism. There was nothing on it when I removed it so it'd just spin round and round in the hole.

2nd Update:

I don't think there is a gearbox. When I remove the handles there isn't a sophisticated piece of metal there. It's simply a large round hole that the spindle goes though (I repeat, "round", not square) and a smaller hole above and below for the screws to hold the handle in place. There just appears as if there should be something between the spindle and the metal rail with the bolts on it. I can poke a lock pick into a hole in the metal rail and shift it up and down to make the bolts move into position. It's like no lock I can find a picture of online. The door will be 22 years old so maybe it's just years out of date. I'd still love to know how it's supposed to work.

In response to TJP Lock & Key:

There's no external lever, just the handle and the hole for the euro cylinder. Definitely no gear box. There's small holes in the rail next to the hole where the spindle goes through so it's clear something is supposed to connect the two.