Hi group, trying to remove the door lock in the picture and replace it with nee. It's for an elderly neighbour who's lost the keys. One of the screws has snapped off in the lock, other removed, the handles won't come off, I've tried prising them but I think as they're that old they've fused to the latch, I've applied some releasing oil to no avail, I don't really want to force it in case it breaks. Any advice would really be appreciated.
