An old house that I recently bought for my family has two sets built in drawers (2 x 4 drawers) that are just basic plywood boxes that are supposed to slide on wood bars. The drawers are hard to open and very difficult to close. The biggest problem is that as soon as the drawer goes into even slightest angle, it just jams. I don't have time to start rebuilding every drawer narrower so that I could fit in metal drawer slides. What kind of other options do I have, if any?