Curved railing bending jig - photo

[mwmkravchenko]

Yes, after I looked again it does look like fire hose. I'm thinking of how I could adapt this technique to metal handrails. It beats the wooden form work I once used for a spiral stair. I wouldn't need the air clamps.

You could use all thread to clamp up the metal parts in blocks. The rest of the structure is pretty useful for either wood or metal as it is a universal setup. I have never done production spirals just one offs every so often.

I think the most important thing for you would be access so that you could weld where you want. bending up the railing into the correct shape is not that hard in this setup.