i bought a blaster for my girlfriend a couple weeks ago and have been working on it and playing with it every day now. the shaft that sticks out of the motor, where the cable connects, lifts up and hits the carb after pulling the clutch 20 or 30 times. has this happened to anyone else? is is a easy fix, or am i better off keeping the bottom of the carb greased? it doesn't seem to be hurting anything, but i dont want it to wear a hole in my carb.