Consist of a base that i secure in the vise on which the clutch fits the 3 prong. Clutch can be secured with strap if need be.. i don't.
The other part is a 1" (i think) box tool from 1/2" set with 3 hard steal welded leg that fits in the clutch arm. The box must be big enought so to fit onto the shaft for stability. What you do not see it the 1/2" ratchet + 3' pipe required to loosen the clutch. (clockwise please... that is reverse way)
To screw back on, i use a torque wrench.
Picture here:
http://www.ty4stroke.com/download.php?id=47413