Previously I use the stock plastic motor mount. After more than 10 battery packs run, my spur and pinion gears are wear off quickly. I decided to replace all new pinion and spur gears and upgraded this TAMIYA (#53666) Metal Motor Mount For TT01/DF02. Guess what, my spur and pinion gears lasts much longer. This hop-up option is a MUST for prolonging the lifespan of pinion and spur gears and it is reasonably priced.