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I did make a mandrel for 7mm tubes a few years ago.

Then I found a supplier here (Travers Tool Co. – Find Metalworking Tools, Machine Tools & More) that has Letter Size Drill Rod 36"long (Letter 'D' .246")

They do ship world wide. And no, he's not my brother-in-law (LOL)

It machines easily enough and you can harden it if you want.

Put threads on the end or use a mandrelsaver.

You will need a metal lathe and means of heating the steel.

I hope this helps.


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