hi im having a problem with my blaster and was wondering if anyone had solved this at all in any way ok so during my rebuild i noticed that my chain had been running on my gear selector shaft and eating into it slightly not enough to get me worried about changing it but i dont want it continuing or i will have tobut has anyone had this problem solved atall and if so how did you get it done i was thinking of some sort of chain roller and sliding it over the selector shaft