Looking thru latest CW and in Service section was a new tool by Motion Pro. They have made a screwdriver/punch type device to use for adjusting shock-spring preload especially on dirtbikes when access prohibits a spanner. Appears to do good for the shocks with a adjuster ring and a jam ring combo. It's made with a tip that shouldn't mess up the stem ring slots and a heavy end for driving. Motion Pro Shock Spanner Punch #08-0483 and maybe about $19.00. Just a possibility???
Roger