I have a 1999 337 excavator , would like to replace a couple of bottom rollers, has anyone had any luck rebuilding them, new ones are gold plated at 450.00 plus each that means it only takes about five thousand to replace all rollers. the 337 is great little machine but parts are heart breakers. Anyone who has one with x-change system for quick change of attachments and is having trouble with spring and locking device , I found an easy fix if you are interested. If have one you will have a problem it is just a matter of wear.