On 13 October 2014 13:36, Dave Caroline <[email protected]> wrote:
> The witness marks on
> http://www.geutskens.eu/neracar/images/PPL/6-Engine/6-Foot%20Starter%20Assy/02-620-Locknut,%20Magneto,rev-gec.jpg
> tell me it was not a true spiral

Do you mean the partial polishing or the grooves in the flat surface?

I hadn't seen the grooves before, they do suggest a milling operation
with a small incuded-angle cutter. Something like
http://www.ebay.co.uk/itm/18MM-X-30-DEGREE-INCLUDED-HSS-DOVE-TAIL-6-FLUTE-MILLING-CUTTER-MADE-IN-ENGLAND-/301237282870

Might do the trick.

In practice it only needs to work, not be some idealised geometrical form.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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