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My second XMod (the RSX) turned pretty slow. Since I couldn't return it (raised the body for front wheel clearance), I decided to mess with the servo. It's hard to describe, but inside there's this slipping function on one of the gears in there that allows the servo to be loose if the opposing force on it is too great. It's like a gear with teeth on the inside and a smaller gear fits into it, the smaller gear being connected to the shaft by plastic spoke "springs" so it can move in and out. I took one of the plastic bushings and used it as a buffer as i tapped those two gears further down the shaft and it tightened it up. I might have to do this to my Skyline as well since it's starting to turn slow in one direction (you can hear it slipping (makes kind of a grinding noise)as it turns left at a standstill). If you don't want to go that far with repairs, then just return it for a new one =)
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