GU HS2851 35/92 Single Spindle Old Type Door Lock Centre Case/Gearbox/Mechanism - Silver

Good solid replacement for a 1998 door easy to fit works great

This is a great and easy, economical way to replace a broken lock. My original lock gave out when I raised the door handle as usual, to engage the multipoints. There was a loud click, and the whole handle had jammed locked, unable to unlock the door. I am not talking about the key part, that was already unlocked. It took patience and 15 mins of coaxing with a mole grips on the follower bar to persuade the lock to open again using the handle. I removed the lock unit, then stripped this lock - gearbox - thing from the multipoint strip, so I was down to what you see in the photo.Here's the thing. I measured my old lock very carefully and this one seemed to be identical, but as it turned out, they make two versions. They are identical in absolutely every respect except for the backset. Backset is the distance from the front plate of the lock, where the bolt and the latch emerge, back, to the centre of the follower (the hole that the bar between the handles occupies) - the same backset measurment applies to the large 'keyhole' shape in the side of the lock case. Measure from the vertical centre of that instead if you prefer.This lock has a backset of 35mm and, laying it on top of my old lock, it was correct. Every other measurement was an exact match too, including the screws on the front for fixing the multipoint mechanism back into place. There is another version of this lock, absolutely identical in every single way, except the backset is 30mm. You'll have pre drilled holes in your door so don't use the wrong one.Fixing it was not too hard. First, determine if the multipoints are locked or open, and slide the control strip up or down to set them in the correct position (I chose open). Then, you have to put the face on the lock up to the faceplate of the whole unit, being careful to hook the control strip notches into the gearbox drivers, one on the top, and one on the bottom. If you don't know what they are, try using the door handle to flip the lock into locked and open position a few times while watching the front of the lock. You'll see the gearbox drivers moving as you do this. Once you have successfuly trapped these drivers between the lock body and the faceplate, re-insert the three security screws you took out when stripping down. Make sure the faceplate sits flat at this point, and that the control strips do not get in the way by moving out of postion. It is very fiddly but, it is do-able.Once the screws and faceplate are correctly positioned, put the whole thing back onto the door, but only fix a couple of screws, one right at the top, and the other two near the new lock, one above, one below.Next, with the door open, insert the square bar and use one of the door handles to gently 'open' the door, making sure the latch withdraws into the lock body. Next, raise the handle and see that the multipoint locks are engaged and operating as you do so. Return the handle to normal unlocked postion, and put the rest of the fixing screws through the multipoint faceplate and into the door.Now, refit the locking euro profile cylinder, flip the handle up, and test the locking action is working. Secure the cylinder with the original supplied screw. Finally, replace both handles and as you tighten up the two fixing screws, stop occassionaly and try the action of the multipoint. On my first go, I fixed the handles and found they would not flip up all the way, preventing the multipoint from fully engaging in the receivers. I loosened these handle screws, and after every few turns, I flipped the handle to locked, and then unlocked positon to make sure the lock was not jamming.It was a palava, but the repair cost me under 15 quid - If I had called a locksmith, a hundred and fifty quid would easily have been charged.You do need to be a pretty expert DIY person, with particular skills at fixing and adjusting locks and other ironmongery, but it is not too daunting. We were lucky, the door that failed was an intermediate one between the kitchen and conservatory, so we had another back door to keep us secure in the 2-3 days it took to get the correct part, and fit it. The fitting took me just under half an hour to give you some idea.Very happy chappie now - especially as, a few days ago, something broke inside the lock and it was near impossible to open the door to do a repair in the first place!In our case, this happened when raising the handle to engage the multipoints and bolt, there was a loud click, we didn't get as far as using the key to lock it, it was locked solid anyway. I found, after nearly half an hour, that applying a lot of force on the handle spindle (I took the handle off, and attached a mole grips to the bar for more grip) and by repeatedly flipping up, and then levering down, while turning the key open - shut - open - shut repeatedly, suddenly the handle engaged with the multipoint and so did the locking bolt, allowing the door to open, so I could access the broken lock, and get started with the above processes.Don't be scared to try this - but of course, if yours is an external door, you need it done quick for security - I was lucky it was an intermediate. It allowed me more time to sort this out.Anyway, a good product whatever size you need, 30 or 35mm, and the price was a no brainer.

A locking part knob is 1 mm thicker than original and will need some altering but otherwise good product for value. Over 100 pounds saved by not calling lockmsith guy.

Bit of a challenge to fit it onto the metal strip. When it was fitted, it worked great and saved buying a whole new PVC door at approximately £450

The media could not be loaded.  Received within one day of ordering. Old mechanism was 22 years old and needed replaced. This was the exact same size and was fitted within 10 minutes. It seems well made and works exactly as it should.

Brilliant my Husband fitted these if you take you time they will make your doors last for many more years

Purchased this lock in good faith to replace an existing failed unit. The quality of the unit is very poor notably the locking mechanism which simply will not engage unless heavily persuaded. There is no lubrication on the unit whatsoever and the quality of parts appear to be sub standard. Was unable to lock the door and quite fortunate not to be locked out of my house. There are cheaper and far better quality locks available from other sellers - please don't waste your time and money with this. The worst part is that Amazon asked me to return the lock meaning it could very well be sold on again to another unsuspecting customer so please, please, please, do yourself a favour and go with another provider - don't end up nearly getting locked out as I did

Mechanism is a little bit stiff and could do with some more grease/oiling, OK for the price.