Got some better pics of the radius bender tonight. Here it is, assembled, clamped on the welding table.

This is one end of the top "die" if you would. The notch in the end plates clears the 1 x 2 in the lower die and lets the centerline of the tube snuggle up to the edge of the 1 x 2.

A few of the notch with the bender assembled. The round tube is centered directly over the edge of the rectangular tube.

This is a cutoff from the tunnels we made. I clamped it in the bender with a C-Clamp. I'll do a little bending with this so you can see what can be done.

See next post for continuation.