I have a metal door with a privacy mortise lock with a thumbturn.
I can't drill any new holes outside, we must use the existing hole for the door knob and deadlock.
I have to replace the existing mortise lock system to a separate single door knob lock set and a separate single cylinder deadbolt.
It means also reconfiguring the doorjamb (it is currently configured to the installed mortise lock).
Inside, the metal door has holes for the mortise and they would have to be covered somehow since the new door knob and specially the deadbolt won't be in the same position as the current door knob and thumbturn.
To make sure I can reuse the holes on the outside, what is the standard (or at least the recommended nowadays) distance between the door knob and the keyed deadbolt?
After removing the current mortise lock system, which is big, it will leave a considerable empty space inside the door, after installing the new door knob lock set and the single cylinder deadbolt. What do you suggest to fill it with? In fact, I think I need to fill it before I even install the new knob and deadbolt, correct?
Inside, because it uses mortise lock system with thumbturn, the hole where thumbturn is installed is not aligned with the outside hole (by design of the mortise lock). I will have to drill in the exact same height so I can install the single cylinder deadbolt. That will leave the hole of the thumbturn open. What do you suggest to close it, remembering it is a metal door?
I had a locksmith just emailing me saying this can't be done, but he was not specific as to why. Maybe because you can't really close existing holes in a metal door? That seems the most difficult part to me. Or because removing the current mortise lock will leave just too much space inside the door?
Thank you for any insights!