I'm looking for SS tubing on the order of 1/4-1/2" OD, w/ an ID of
.120 to .250, much like what you see on locking Quick Release detent
pins, where you press the button in the handle, which release a detent
ball.
In fact, these are what I am making! Currently out of brass.

Iny leads?

http://www.pennstainless.com/ has 1/4" OD x 0.065" wall (so .120" ID)
and 1/2" OD x 0.120" wall (so .260" ID) in seamless 304 and 316. They
have the best SS tubing prices I've found, and we buy a fair amount per
year at work.

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Regards,
Carl Ijames carl.ijames at verizon.net