I'm out of touch with S/A's, but would it be viable to run the bolt through the other way ?
From the replies, I'm beginning to think I'm the only one left who welds with oxyacetylene. Sometimes a mig, but I'm better with the torch.
I have a gas set that I used for several years when living in the bush with no power and quite like it for lots of tasks, but bottle rental increases made that unviable, so now with access to spark food, I invested first in a small Arc welder, and then a cheapo MIG that I run with gasless wire- one of my best investments.... when I did my aforementioned misdemeanor, I knew full well about isolating the job from the vehicle, but somehow had a massive brain fart and because I was welding a steel beam not part of the 'tilly I had it supported by the edge of the tray....
I am a committed gas welder and will remain so in the forseeable future.
Bought a Dillon gun back in the 80's and never looked back.
When Lind`e gas kicked off they allowed customers to buy their bottles ( at the price of 2 bottles ) which I took up thus paying no bottle rental till they sold out in 2005.
One of the tool companies ( Toolex I think ) took CIG ( BOC ) to court about refusing to refill bottles other than their own & won the case , although you have been hard pressed to hear about it.
Thus now days they , and all other gas suppliers are compelled by law to refill any legal bottle presented.
Liquid air did the dirty and changed all of the valves on their bottles to ones that are not available retail and of course their filling stations are now incompatiable with any other bottle ( morons ) but BOC could not afford to do the same thus you can buy bottles from almost any of the bigger tool store franchises and because of the same court case the refill price is almost the same. And about time.