As I belatedly read the digests of the past week or so, I saw the inquiry
for a source of brass tubing.  This is a good opportunity to mention Small
Parts, Inc.  They have the brass tubing in the desired sizes in either
0.014 or 0.028 wall thickness.

It's also the only place I know where you can get ball bearings of any
size in small quantities.  They have an astonishing array of neat stuff,
including gears, wheels, belts, stock, fasteners, tools and chemicals.
Phone 1-800-220-4242 or FAX 1-800-423-9009.

A. B. Bonds