I'm refurbishing an old door, which is fairly good condition, but has a poorly-repaired hole (~6mm-ish) drilled in itjust above the keyhole (well north by noth east of it). Apparently this was caused by drilling the mortice lock to get past it at some stage.
Fixing it won't be hard, with a bit of 2-part filler, paint etc, but I was wondering if I should do anything else. For example, BS locks are supposed to be 'drill-resistant', but the one that was in this door presumably wasn't (!), so perhaps there's a case for putting something into or across the hole to make any future drilling attempts more difficult.
I've no idea what the outcome is of drilling a lock: Presumably it releases the levers or something. Would that mean that drilling has to be done in exactly the right place, or would making this one more difficult to access just allow it to be drilled in a different position?
Of course, there could be a benefit in having a drillable lock, if all the keys were lost/locked inside, but this is probably outweighed by day to day security, and I do have a way into the house for that eventuality anyway.
Any thoughts chaps?