I think I have every type of plank bender gadget out there…tried them all. The one I now use for bending hull planking is a mechanical bender that is like a pair of pliers…the head has a V jaw on one side and a flat jaw on the other…pressing or pinching the plank creates an indentation on one side which curls the plank. The closer and deeper the indentations the sharper the curl. The exception to this is when I need to bend a plank that will be visible on both sides…then I use the heated iron, soaked planks, and the bending jig as noted above. Obviously the mechanical bending tool marks up one side of the plank…but when glued to the hull this does not show.