Thorp used a dolly bar to back up the flange material, and a plastic mallet wth a wedge shape to move the metal, about 1/4 th inch at a time, into the corner formed between the edge of the form block and the dolly. When the flange has been formed to a width of at least 5/8 th inch, most of the still-vertical material that remains is trimmed off with hand sheers, and the remaining material is slapped down with a solder bar.


BJC