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.
...I was wrong about nobody making and selling the helicoils for this any more. I've not used
this one personally, but it looks like their standard kit, which I have used for other stuff and their products work as advertised. The price is about half what they get for the Unior threadsert kits, but you need to drill your own hole, and it needs to be straight. The insertion of the helicoil itself is a snap (pun intended).