Originally Posted by
streetstomper
Yes, that's a problem I've seen. Looking around at general purpose helicoil inserts, pretty much every 9/16 I saw was 18 or 12tpi, so I'm pretty sure just going to an auto shop wouldn't work for this.
Not surprising....9/16" 20TPI is pretty much singularly used on bike crank arms....and most helicoil kits are for automotive use (improperly torqued spark plugs are like bullets shooting into car hoods).