I finally broke down and bought enough tubing to do the missing reservoirs on my 55's. i had to buy minimum 6 feet of tube, so now i have plenty left over. I any of you want or need a new or custom length powder tube, PM me with your specs. I have enough to do maybe 6 or 8 depending on the lengths. the tube is 2"OD x 1.75 ID (.125 wall) and can be lathe threaded if needed, 2"x 24 tpi. the bulk tube cost Me $.50 an inch.
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The orange colored units are threaded, the Grey ones dont seem to be, I havent been able to get the only one I have apart. If anyone has one apart, I'd be interested in the method. i made one 5" and turned it with 24tpi and it fit the orange unit and looked great. 8" looked awesome for BP use.
I will cut to your desired length for $.50 per inch and thread for $5 each, shipping yet to be figured out, as these need some protection. I will look into the padded envelope.
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I finally got the grey measure hopper apart without ruining it, and it has an annular ring in the base to snap the tube over. Not so easy with the one I cut from the .125 tubing that I am using, had to heat it some but it will work, just had to be Careful...