On a crank from Sram, Race Face or Easton, it is important to preload the crank correctly in relation to the bottom bracket. This is done with a plastic ring with an extremely delicate screw connection, which can quickly get messed up. The cleaning specialist Muc-Off now supplies a clever preload ring that makes setting the correct crank bearing preload (almost) child's play. A magic trick on how to dismantle a stuck crank is included free of charge.