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When you say horizontal sashlock are you referring to the ones where the keyhole and hand sit next to each other? As far as I know this is the only way you get the clearance on the handle you're after.
I would point out though that by moving the lock in the way you are suggesting you will be taking out a lot of the remaining tenon that holds the door together. The result of this will be a substantial weakening of the door.
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Yes, the side-by-side arrangement was the one I meant by horizontal. I hadn’t thought about weakening the door like that so thanks for the warning!
This alternative has an 82mm backset which might be a compromise:
https://www.periodpropertystore.co.uk/ironmongery-c4/door-furniture-c22/mortice-locks-c25/imperial-locks-g5000-5-lever-mortice-sashlock-p5378It’s an old’ish house and for whatever reason in my mind a handle doesn’t look appropriate.
I’m going to refurb our front door and would like to replace the handle with a knob on a rose+key hole thing but that would be too close to the frame to comfortably open/close. It’s a five lever sashlock with the centre of the handle 50mm from the lip of door.
What are my options?
Is there a type of sashlock thats 30mm or so further back that I could chisel out. Or would I have to change to a horizontal sashlock and fill above and below the void left from removing the old taller one.