I'm not built like that one guy in the video is. I think the design shown in the 1st video can easily be modified to include one along with the rollers and bars of the "H" slingshot.

Too dangerous!

But if you want one that can crack a brick, you'll have to make your own.

I have enough space on my lot to set up a target range of up to 50' in length. The house would be the back drop but as i plan on residing in 2-3 years, I wouldn't care too much about the occasional stray shot hitting the house. In bad weather, I could target practice in my 24' long garage.

I always had to wear a glove on my left hand. Sometimes those surgical rubbers can snap your knuckles.

with those wrist rockets when I was a kid. I don't remember ever getting in trouble with one, but I do know they were illegal to shoot in town. Since our propty line was the city limits, we'de go into the field next door to fool around wirh them. There no windows to break either.

that would get you into trouble. But I wouldn't know anything about that.

No drilling or cutting. The gap between the 3/4" outer handle and 3/8" inner handle could be taken up by washers and the washers could be held in place at the top and bottom with nuts threaded on the 3/8" nipple.