Originally Posted by
DannoXYZ
Chainwhips are only needed to hold the cogs steady while loosening the lockring on cassettes. Freewheels just need the removing-tool and that's it.
Well I did use a chainwhip to get my cassette's lockring off. But it was a tool I bought in the 70s, before cassettes even existed. And for whatever reason, I bought two, so I must have thought it took two. That (the 70's) is way beyond my working memory, btw. I know I've used it on freewheels before.