The Park Tool CP-1 chain whip pliers can be used to hold cassettes solidly during lock ring removal. Thanks to the long lever arm, you need less power to fix the chain links at the sprockets, which prevents unintentional slipping typical for standard chain whips.
· 35 cm long
· dual density grips for maximum comfort
· material: steel, forged
· spring loaded return
· safety catch to fix the arms
· for 7-/8-/9-/10-/11-speed cassettes
· grips sprockets from 9 - 24 teeth
This is what we use our workshop, it doesnt slip -ever, you will never get grazed knuckles again...its only seems expensive until you use it, then you wished you had bought one years ago.