Well Willis, I'm not sure about the rule thing, but your question can't really be answered without a lot more information. May I suggest that you take some very good pictures of the razors in question and email some of the pros with the question of a budget estimate. Not an economy estimate but an estimate for the purposes of budgeting. This will give you a ballpark number or two to help you decide if you want to go in at around that price. Estimates are not quotes however, as I doubt anyone without a razor in hand would quote anything. Just an idea. I do not do pro restoration nor have I had any done but a thought on the subject.