The bolt can be made the same way. Use a 1/8" NPT thread in the bolt head and an adapter fitting. The tubing size becomes irrelevant, as there are thousands of factory made adapter fittings available in all sorts of tubing sizes. Why do people insist on making things difficult when there's a quick, inexpensive work-around available?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!