My console case sounds like a subway coming to a stop. It barely rolls at this point. Currently there are 3.5" Colson casters on it. They are about two years old and are the casters that came with the case. I have tried WD40, but it does not help. Is there a better repair solution or is it time to replace? If so, with what? If I'm going to put new casters on, I would like to stick to the 1.75" x 3" bolt hole spacing.