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Eventually I got a M14 tap with a 2mm pitch and I started the worm with that until there were well defined teeth in the worm wheel. I then changed to my home-made ACME tap and continued until the worm gear was done. A new ACME worm was then mounted on the guider with two pillow blocks that I used previously.
The assembly is quite heavy but very solid.
There are more photos on my blog....
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