This new compression tool allows you to compress the spring without removing the clutch from the engine. Simply remove the drive clutch bolt, thread this tool into the center of the clutch and compress the spring. This allows you to safely remove the clutch cover cap bolts without damaging the bushing to change the drive clutch spring or weights. Designed specifically for the P-22 and P90-X clutches, but will also work with most models using a P-85 style drive clutch.