Make a square brass block to go under the banjo bolt with a 1/8" NPT threaded hole in it. Then screw one of these fittings into it:

www.ebay.com/itm/134273637068?

www.ebay.com/itm/115502079034?

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!