Build a Stick Straightener Steamer
I don't have my act together on this as a few drawings need to be done.
However, just to say; I designed a box from structural ply with drain pipe inside clamped by a plastic door with a steam connection and a 15mm ball valve to control pressure and give condensate an outlet, thereby trapping the steam.
Exhausted through a condensate valve at the invert to control the pressure. Both doors hinged with over centre latches. The pipe, dia 100mm, is a little restricted, but the efficiency means control compensates.
Chicken wire in the bottom helps keep condensate way from cooling the sticks.