I'm having an issue with the crank not sitting flush with clutch bell. There is about 3-4mm gap between the endbell and the shaft. The flywheel and brass corn are fit properly on the saft, they can't get any closer to the motor. Am I missing something? It that way on both the stock Ofna Force 25 and my OS RG. Would the Ofna clutch bell kit http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNT03&P=Z help me out? Or am I missing the obvious.