I doubt if anyone here can help me but it's worth a shot. I have a nitro schumacher that I got off of my sister's husband and I'm having problem's keeping the hub's tight. They stay tight for about a minute running it and than the screw back's out. I tried lok tight and no luck I even got a new screw and nut and no luck there either. If any one has a suggestion on how to keep this thing tight please help me out. The only thing that I have modified to it is I put a 3 speed trans in it. Which all it is, is 3 gear's bolted direct to the motor bigger to smaller gear.