In a message dated 2/22/00 6:18:46 PM Central Standard Time, tesla-at-pupman-dot-com writes: << .25" Cu spaced -at- .25" Primary (we added 20' for another 3 turns) ANYONE KNOW A GOOD WAY TO SPLICE THINWALL TUBEING FOR THIS > 3/16 Cu telescopes nicely into 1/4-inch. 1/4-inch telescopes into 3/8. You can drill and tap it for set screws or you can sweat solder the whole joint. this works very well. Cheers, Ralph Zekelman