John's photo shows the "low cost" blade tensioning design, a draw bolt having a stud. One nice thing about this is that the draw bolt can be flipped 189* so the stud points to the opposing side as the front blade stud does. This eliminates the untensioned blade I had mentioned before when doubling up.

My Craftsman styles do have a limit of one blade for the usual blade/handle alignment. But they do have a peg hole on the bottom of the holders where the plug can be inserted. So a second blade position at 90* to the usual is there and could be easily a doubled up location. Although actually sawing with the holder frame also at 90* to what you're use to will quite the effort and I would think not as controllable in the cutting action.

I have lost the Craftsman style pegs more that once (and bought used frames with missing pegs) but I have plenty of rod, nails and I have even machined a few too. NBD.

I see this "what hack saw is better" much like what kind of music is better. I'm happy to share the music I like with others but am happy with others liking types I don't (like opera). Andy