Using a 7.3mm drill bit in a drill chuck I reamed out the original M7 metric fine left hand thread. Gulp. Then, using an M8 1 pitch left hand tap with a 6mm spanner as lever on the square top of the tap, gently tapped a new M8 thread. Much backwards and forwards working of the tap plus a good blast of air to clear debris and the new bolt went sweetly home. In a belt and braces style I have also purchased Loctite 270 stud lock with a breakaway of 33 nm. Decided to go without this to start with and see if the bolt holds without it. No point creating a fresh nightmare if it should nonetheless slip. So here goes for a start up - in the rain.
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