My newly acquired 3T Climax runs, but hesitates each rotation of the drive shaft. The problem is that two of the cylinder-shaped "universal joint" housings, located where the drive shaft connects to the first and third trucks, rub against the u-shaped keeper that stretches across the trucks under the universal. (On the last page of the exploded parts diagram, Front Truck, PartOAJO6 is rubbing against Part H828X-00v02). The universal joint is not a perfectly round part, and the protruding side rubs against the U of the truck part every revolution. This makes the Climax hesitate and strain each shaft revolution as it moves down the track. At low powers, it doesn't move.

!. has anyone else had this problem, and , if so, how did they fix it?
2. can the truck cross member (which has the U in it) be removed and repositioned or replaced or sanded thinner and replaced?

Any suggestions will help. Thanks, and pardon my ignorance of correct terminology.