In this episode of "what bad experiences did teach me", we will talk about chain whips

I see a lot of youtube videos in which people use the "chain whip" incorrectly, even including the famous cycling channels in youtube. What most people do is they wrap the chain whip to one of the larger cogs which ensures very little engagement and in a worst case scenario, as you exert power to the wrench to loosen the cassette, the chain whip disengages from the cog and breaks (happened to me).

What you should do instead is you should choose a "smaller" cog to fully wrap the chain whip and secure the tip of the chain with the straight part of the chain whip tool. This way, no matter what kind of force you exert to the wrench, chain will stay in full engagement on the cog.