Al Patrick wrote:

http://www.accuratebuilding.com/publ...to_hacksaw.pdf


The link shows an older style of hacksaw, which has an undocumented
feature not generally seen on more modern designs, that I find useful
sometimes.
The front and rear blade holding pins can be set to several different
orientations, including 180 degrees from each other. This allows the
fitting of 2 or more blades at the same time, for wide cuts. The angled
pins, being parallel when set this way, hold all blades equally firmly.

Jordan