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Al it's probably not much help but I will try and dig out the speil I wrote
down when I cut some 1.25 filter threads in the lathe for my filter wheel.
I have thread pitch guages and I vaguely recall that with the metric gauge
none were spot on but 0.6 was closer than 0.75 or vice versa.
And I think that I cut them with the 0.75 setting and not the 0.6
on the thread cutter gears. I think! i will check that.
I found that with just one or two bites in the thread at that scale
it didn't matter too much.
My Baader 1.25" only just grabbed in the thread I cut and the DSI
Meade set were snug. Can't help at all with the 2" size though.
Steve
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