I have found the 1/4 20 threaded rods on ebay. Should I just order 2 6' sections of it (dollar a foot roughly) then just cut it on my own?
Why buy them off of eBay and pay shipping and handling and risk having them bent in multiple places while in transit? You can just pop into your local Home Depot, Lowes, ACE Hardware, Menards, etc. and hand pick the straightest, cleanest threaded rod you can find. You pay a little extra in tax but save on the S & H.
You can make the adjustment blocks out of almost anything that is at least 3/4" thick and solid enough (delrin, cast acrylic, oak , steel, aluminum, etc.) when drilled and tapped to allow the 1/4" - 20 bolts to be tightened to hold the gas pipe without cracking or splitting.
Keep on truckin'. It sounds like your well on your way.
HayTay
Don't be the one that stands in the way of your success!