I had to cut a window in a wood box, but my saw was too big and clumsy to work with in the confined space of in box and gave a really small range of motion. So I made this handle to be able to make cuts more efficiently.

I recommend installing the blade so the teeth cut on the pull stroke and not the push stroke. (example in the photos)

I inserted knurl nuts instead of regular nuts for aesthetic reasons. The bottom screw goes through the hole in the saw The top set screw holds the blade firmly in place to stop it from rattling.