One step forward, two steps back.

This bolt broke off while I was torquing the girdle. It snapped below the surface of the block, but luckily I was able to back it out with a left-hand drill bit. Unfortunately that meant taking everything apart again. The threads in block are munged so it looks like I'll be needing helicoil (a.k.a. thread repair kit).

Tapping new threads in the block in preparation for inserting the helicoil. The trash bag is there to prevent metal chips from contaminating the block.

A helicoil on the end of its insertion tool. Little did I know at the time, but that helicoil turned out to be the wrong size, despite what was clearly printed on the package it came in!

Eventually I got the right size and everything went back together again.