Pedro's Vise Whip cassette locking pliers
The end of fummeligen whip. The Vise Whip is a professional grip pliers with which one can access the cartridge to then, without slipping, to dismantle. They locked without saying on pinions of 11T to 23T, whether Shimano or Campagnolo. Even 'seized' single pinion can thus gently loosen the freewheel.