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This particular model is intended to replace the 35mm backset double spindle version. If you're having problems with your door lock, the gearbox is almost always the problem and changing it is as simple as removing a few screws.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.