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Thanks Jo,
I have milled a few slots into a section of the ACME threaded rod to try and make a tap. It works quite well but this "ACME tap" cannot start the aluminium worm blank in the same way as the M10 tread would. This means that I will have to manually cut or saw the starter slots into the blank for the ACME thread to lock onto. It's quite a bit more work with about 200 odd slots to cut!
Unfortunately the M10 has a 1.5mm pitch and the ACME is 2mm so I can't use a metric tap to cut the first slots on the worm blank. I don't know if it is possible to buy a ACME thread tap, I suppose it is but I will try and use my own first.
This is just another lesson learnt and I will find a solution for it....
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