We are now able to offer tubular latches (mortice locks) in our on-line shop for brand new doors or to replace old ones of course. Sourced here in the UK these latches work perfectly with our door knobs. They sit 102mm in from the edge of the door to avoid scraping knuckles on door frames. They also have an 8mm follower (the square hole through which the spindle will pass) thus ensuring the door knobs don’t wobble. You can order them along with your mortice door knobs in our on-line shop here.