I am in the process of changing my front sprocket. I followed the procedure , while the chain was still on, of using a piece of wood in between the wheel and rear swing arm to stop the spindle from turning (had it in neutral as suggested) . So I was able to remove the sprocket nut. But now that I have the new sprocket on how do I tighten it since the chain is off and I cannot use it stop the spindle from moving while the engine is in neutral? What is the proper procedure ?