Please save the chisel and hammer for your DIY dentistry, and buy this tool for the inward-facing 20-tooth crank cups.
Always remember -- the cup on the drive side has left-hand threads.
Always remember -- the cup on the right-hand side has left-hand threads.
Always remember -- the cup on....
SERIOUSLY... when you need this tool, this is the tool you need. And you don't want to not have it when the day comes that you need it.
AND A TIP... I found me a bolt of maybe 40mm long and the same thread as the crank arm bolts, and I use it to hold the tool gently but firmly engaged before I turn it.
Similar to what we do with many other tools, yes. ...Because it saves us damaged tools and maybe damage to the bike also, yes.
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