OK, I wanted to make a handheld version of the sling-x-bow with rollers.
Of course flatbands, and also of course with pulleys. This design requires more attention to make the bands stay safely on the rollers, as the draw will be much more irregular than that of the crossbow, with the strirrup and the two handed draw.
So I shaped the rollers liek hour glasses, and added guides for the bands. Works pretty good. The thick round pieces of dowel in front of the rollers help to make the bands stay on the pulleys after the shot.
The result very much looks like a flatband version of Robert Blair's ComBow! So I officially bow my head to the master.
Performance is, as expected, about 15% better than using conventional frames. It is a lot more bulky, though.
Painted it "camo" style just like the crossbow, so I can compare both weapons. Video tomorrow!