You might consider Holobar thick wall aluminum tube, available from
several sources on the web I usually find scrap ends at my local SIMS
metal recycle yard or local Al remnant dealer.
see
http://metalsalesusa.thomasnet.com/viewitems/round-tubing/holobar-heavy-wall-tube-5086-h111-5086-h32-6061-t6
A job shop could turn the id of the stock 2.5id x 3od to whatever you
want or find a friend with a lathe and a boring bar. It's a simple
small job for a 10 or 12" length.
Grant
KZ1W
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