Below is a quote from Randy Caster (TRF driver from the USA) found in RCTech's forum:
"Tamiya has recognized an issue with the idler gear material, and are already working on a more durable material. Some people are having issues, some aren't, I think it has a lot to do with how much motor you are using, and making sure your diff/slipper are set correctly.
For anyone building, or rebuilding their 201 transmission, before installing the idler gear, boil it in water a couple times. This will help to soften the material and make it less brittle, and should hopefully solve the issue altogether until the new parts are available from Tamiya.
If you do happen to strip an idler gear, I would recommend replacing the diff gear and idler gear. This is basically just to be sure that none of the teeth on the diff gear are chipped or cracked and would cause another failure."
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