Found my tap set, for anyone looking to do this I used M6×1 bolts and tap. Seemed a perfect fit. Hardest bit was finding similar bolts.
Not sure if it's desecration putting metric threads on something that is pretty much all imperial.
Suitable rusty piece of metal with hole in the middle and it came off easy.
Word of warning to those who want to do this, very easy to tap straight through the flywheel!
Points were covered in some kind of corrosion but cleaned up well.
Tested coil and got 8.76 k ohm which I believe is acceptable?
Still no spark so the plug might be a bit duff, removed boot and tested without to no effect but hoping that it's a simple solution.
On the positive note I made a lovely sponge insert for the new filter, although they are available to buy I am cheap.
Peeked down the exhaust outlet and cylinder looks a little rough but we'll see how it works out!
