I was taking apart a cheapo multi tool and when I came across the saw I was trying to decide if it was worth keeping or not. It's a pretty aggressive saw and chews through wood pretty well, but without a handle it's too difficult to use. I tried adding a heavy duty split ring to give my fingers something to grab onto, and that worked a little better, but it wasn't great.

Finally I decided I could use the corona knife sharpener I carry in my PSK as a handle. I drilled a hole to match the one on the saw, and originally was going to drill a second hole for another screw/nut to serve as a stop, but I discovered it works well enough when tightened to not need it. It breaks down into two separate (and flat!) pieces to better fit the kit.

The screw sticks out far enough on the right side of the assembly that you can wrap your index finger around it and use it to help grip the saw, it's more comfortable than I expected.