I got my copper tubing from an online hobby store. I put a small steel bench block under my beads if I need to tap with a hammer, but I've also done it on many other surfaces and not noticed too much of a difference.
I usually make my tubes about 3.6 - 4 mm longer than my bead. Digital calipers are great for measuring. I got mine at Harbor Freight for under $10. They make life a lot easier. Put the bead in them, then zero the calipers, then open them until it reads 3.6 or so... then hold them against the tubing and mark it.
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Cori C-R
PS - This is what part of the alphabet would look like if Q and R were eliminated.
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