Hi all, We have a couple of different interior doors in the house that don't close properly. The edges on all sides of the door don't hit the frame, so the doors work great in that respect. However, the "depth" of the door is the problem. The doors I'm talking about have to be pushed in very hard for the knob to actually click and "lock" in place to hold the door shut. They are ancient knobs that are going to be replaced also, and the doors will be painted. Is there a good way to give them some extra "depth" when closing so that (even after I add another coat of paint and the new knobs) they will shut properly? Thanks.