Okay, so my 7075 finally got here from an Israeli seller a few days ago, after more than 3 months in the mail., so i re-paid the seller her refunded money. Some 6061 did arrive... but was only 1/4" thick, and there's been a lot of messaging back and forth as the seller and eBay and I try to come to an agreement... which doesn't seem to be working out. Looks like he's convinced eBay that I'm a scammer and that he actually sent 1.25" thick stock. If this transaction fails after appeal I may just close my eBay account. While it's easy a lot of the time, a couple of crooks like this (themetalmerchant in this case, with whom I had one earlier transaction which went fine) are making it seem more trouble than it's worth.
Anyway, I shaped one of the blocks and bored the holes on my little TAIG lathe. Started the bottle thread with the tap, then decided to grind that down to convert it to a bottoming tap and proceeded to finish the thread. Bored the QD adapter hole, then took it to my old workmates at Toby Cycleworks where Tito enlarged that hole and tapped it in about a minute on his gigantic WWII vintage mill. Didn't want my money. Checked the large threads and found them to be fine.
Getting home I finished shaping to get the thing comfortable for handling then heated it to about coffee hot and sprayed with Rustoleum epoxy appliance paint then baked it once air dried for a couple of hours. Made a stainless steel band which is wrapped snug around the brass fill plug and bolted to the block, providing some protection against movement at the front end. Yesterday I made a steel bracket to hold the back end against the front grip frame, then once that held reasonably well made a kydex heat-formed cup pressed over that and the bottle for an exact fit, securing the bottle at the back. The kydex is hot glued then drilled and riveted to the 0.75" x 0.125" steel. This pulls the bottle firmly against a shaped ebony block which spaces it from the main cylinder.
Managed some testing up to 1,200psi for a few short strings and the bottle seals perfectly and is rock solid on the rifle. Unfortunately my 1.8K burst disc blew out, apparently defective as pressure shown on both my FX pump and the Ninja gauge was exactly 1,400psi at the time. But I'm going to get the regulator tested and adjusted soon and replace the burst disc. My testing before that then a bit without the bottle after the failure tells me that a setpoint of about 1,100psi would deliver my desired power level.
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