Originally Posted by biknut
I made a special tool with a piece of stock chain attached to a lever, to lock the sprocket in order to unbolt the sprocket nut.
To lock the gears on the clutch side I've found that a penny stuck between the pinion, and clutch gear works well.
Penny (as everyone has them) works just as good. I could never see making a tool as it wouldn't be used enough to justify.