Credit for this idea must go to the BadAss slingshot guy...though I had been musing along similar lines. It is SO simple and seems to be very effective with just a little practice. Anyone could make one in half an hour with a bit of broom handle and a nail. The slingbow I'm testing it on has 4 bands a side of TBG (estimated draw of a tad over 50lb) and it works smoothly with this . I do have a mechanical release but I think this may be the one I use from now on.