When I was into archery, many moons ago, I used to shoot Easton Ace arrows (Aluminium Carbon Extreme) these were a very high grade aluminium tube core with carbon fibre laid over it. They are about the thickness of a knitting needle and so stiff that when you first handle one you cannot believe how stiff and light they are.
The guy spent about ten minutes on the shaft and when he had finished and spun it on the jig there was no perceptible imperfections.
I also got a bit lucky with the die for cutting the thread, The Tap and Die Company were clearing some dies that they describe as HQS, which the guy said are better than HSS, reduced from £38 to a fiver. I had my doubts, but it cut the 316 stainless no trouble (except for my clumsiness, no machine shop training)
So I now have a new propshaft and a spare and a new brushless motor which lines up as well as I can measure with the shaft.
Hopefully off to the lake on Sunday.
