I am a big fan of the Design Plus Pro Striker machines, many fond memories of playing those. Since the machines are hella difficult to find (and I think the shipping weight is like 760lbs!) I've been kicking around the idea of building a half scale bowling lane based on the Pro Striker design (I think they basically did half scale except for the "lane" which is about half the length you'd expect). I have really clear pictures of their pin setting mechanism so I'm clear how they did that - simple but functional. I'm not clear how they kept the pins from dropping - I see a small pneumatic hoses going to black plastic rings around the holes where the pins drop but I don't have any action shots of what those do - it looks like maybe they extend a small piston to hold the pin against the side of the hole but I'd love more detail. I'd also love to see how they implemented their ball return mechanism if anyone has pictures.