Bill, Charlie, and Joe:
Thanks for your insight! Yes, the Knew Concepts looks fabulous, but I didn’t want to spend $150.
Instead, I made a prototype out of 1/4″ aluminum, and made it kind-of like the KC, but with one major difference – I made 2 carriers; one for fret saw (scroll saw) blades, and the other for pinned coping saw blades. I turned a handle from cherry, and it’s very strong and keeps the blades noticeably tighter, and easier to work.
I drilled it to make it lighter, but may have taken too much off the corners, as it does bend a little bit.
More news as it develops!