I've now rebuilt several of these mpc style motor trucks. Th worm gear was changed to "metal" I also changed the drive gear to Metal. I put a small nylon space behind this gear.. The insert is plastic and not readily available.
Here would be the ideal rebuild.
1) Take apart the motor/ separate out all swedged pieces.
2) The plastic insert would now be removable.
3) Drill out the pinion studs in the plastic insert..large hole.
4) insert sintered iron or other pinion stud in the metal frame.
5) replace,worm gear and others with your choice of material
Rob, helped me with this a ways back. I tried to ordered a couple of drive studs...
But, the hole in the metal plate is larger. I'm still looking for one that will work.
simply it would make the motor bullet proof
