I’m fond of Joerg Sprave’s YouTube Channel, called The Slingshot Channel. He’s a former strongman who is very into slingshots, as well as pretty much any device which stores muscular energy in order to fire a projectile.
He has often made various sorts of slingshots, which he has sold, but recently he’s been getting into bows with magazines to enable rapid fire. From there, he’s recently developed a magazine-fed slingshot. This reminds me a great deal of the sort of inventions one often saw in the 1800s, except he’s developing them right now.
Here is his video where he presents his first prototype of the “instant rufus”:
It’s very interesting indeed to see someone develop a novel machine that can be made from parts one can buy at a hardware store. It’s quite a bit of creativity on display, here.