Angie, I'm sorry I don't have answers for most of your questions, all I can tell you is the mandrel size I use is larger (maybe 5mm). It has to be larger, the only thing I remember for certain is the inner diameter of the sterling tubing I used is 4.37mm. I bought that tubing in a bulk buy - I think the organizer purchased the supply at Thunderbird(?). I haven't looked in ages, but I remember there used to be tubing for sale on Etsy.
Good luck - I hope you find the info you need.
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Orange Cricket with 10L oxycon and NG
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