ok... I have this 100 year old door that was exteror. I have replaced the glass and molding, sanded and sanded. My problem is this. The door is going to be placed on the INTEROR of our home, was to wide, so it has been cut to fit..however... we have a hole that needs to be filled where the old lock was, if it was really small I would use wood filler, but it is a good size, so how do I fix this or can I?