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GU Old Style Replacement Door Lock Gearbox Centre Case 35mm Reviews

4.6 Rating 65 Reviews
Read GB DIY Store Reviews

GU Old Style Gearbox 35mm
A replacement centre case gearbox for the GU old style multipoint door lock mechanism. If you're having problems with your door lock, the gearbox is almost always the problem and changing it to a GU Old Style Gearbox is as simple as removing a few screws.
GU Old Style Gearbox Information
Important Measurements: 35mm Backset / 92pz Centres
This is the mechanism inside the door that is operated by the handle.
Most likely to be the problem when a lock fails.
Reversible latch for left or right-handed doors
Fitting Advice
The gearbox is easily reattached to the locking strip via three-star head screws. 
Technical
A full technical diagram is included in the image gallery.

About GB DIY Store:

GB DIY Store is a family run, UK based company, which offers an extensive range of uPVC hardware which includes window handles and door handles, repair parts, tools and fitting supplies.

The team here has over 25 years experience in this industry, we have literally done it all. We started out manufacturing and installing windows and doors and slowly progressed in to repairs. Now, we offer a very extensive range of repair parts for windows and doors.

With our knowledge and wide range of repair parts, we can solve any problems you may have with your uPVC windows and doors. Whether its a repair, upgrade or just some good old fashioned advice, we've got it.

Our team is always happy to help, so please do not hesitate to contact us.

Visit Product Page

Phone:

01623622205

Email:

nathan@gbdiy.co.uk

Location:

Unit 1, Fox Covert Way,
Mansfield
Nottinghamshire
NG19 0FR

Gavin Shorters
Verified Reviewer
Fantastic next day service and quality replacement part many Thanks
Helpful Report
Posted 1 year ago
Did the job but wasn't as good quality as original and had to make relatively minor changes to the door to make it fit.
Helpful Report
Posted 1 year ago
Hugh Buchanan
Verified Reviewer
The second one I bought worked okay. The first one wouldn't work properly. You could stop the lock from working with your finger and you couldn't turn the key to lock the door. Don't know what the problem was.
Helpful Report
Posted 1 year ago
Author didn't leave any comments.
Helpful Report
Posted 1 year ago
Dyfrig Clement
Verified Reviewer
Excellent service from GB DIYStore. The first unit had a clunky movement and jammed on first use in the door. I contacted GBDIY store by email and explained the situation. Nathan replied promptly and promised to send a replacement unit tested by their warehouse manager prior to shipment by next day carrier. The unit was received the next working day. The movement was smooth before fitting and when fitted in the door it worked perfectly with smooth movement. It was disappointing that the first unit failed but I can't fault the support from GBDIYstore and would certainly use them again.
Helpful Report
Posted 1 year ago
The fitted lock was very rough to use and the internal workings were tight and could not be relied on to unlock, I rang GB DIY store who was very helpful and sent me a replacement the same day at no charge and it was an improvement
Helpful Report
Posted 1 year ago
Just what I ordered and fast delivery
Helpful Report
Posted 1 year ago
Jeremy Bottley
Verified Reviewer
Used this to rectify a 92/40 unit. Had to adjust the door but it worked a treat.
Helpful Report
Posted 1 year ago