John - I've been looking at benders in various configurations
online today, but it looks like most of them have an upper limit of 5/8" for solid rods, unless you're looking at the big industrial ones. I might call a
local machinist and see if I could hire him to do it.
Bryan - I haven't gotten into welding yet (though this
project might be a start). What do you mean about low hydrogen? I'm guessing something to the effect of preheat the metal first, but I don't really know.
The seller I'm currently looking at has 3/4" as the smallest size he has available. I'm going to watch local ads (since I have a few months before it will be warm
enough to start working on this anyway) and see if anyone closer has it - I'd like to handle it and see what it's like before I drop a ton of money on it. Given what I'm seeing about bender capacities, I suspect the smaller diameters would work just fine..there's a lot more strength in the solid rod than a pipe.