It's been machined for quite a while now. Time to do some more.
15 degree angle block and tool makers vice used to align the flywheel. Centering the vice under the chuck is easy if you use the V groove in the moving chuck jaw. The fly wheel aligns itself into the gap in the bed of the tool makers vice, Problem is getting close to the hub with the rim of the fly wheel interfering with the drill chuck.
Set up to drill tapping hole for 3mm set screw. It's not possible to centre drill, unless you have a very long centre drill which sort of defeats the purpose.
Another view. Aesthetic recommendation is to align hole with a spoke.
Tapped after facing similar access problem with tap handle. Eventually use a pin chuck arrangement. Fortunately cast iron is really easy to tap. Using a stainless Allen head bolt instead of grub screw - I don't have a small enough Allen key to fit the 3mm grub screws... Oops. Will shorten it at a later stage.
Painted with deep green "Hammerite".
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