by scootntootn » 01 Mar 2015, 01:16
If you know what you're doing, you won't need his instructions. I'm sure BM could reverse engineer it easily.
He uses aluminium to create the triangle, and then something with more grip on top of that.
If you could start with something that already has a variable enough throttle, all you need is a way to make it more stable. It's rather noisy, though, and it's possible to find cheaper ones if you know where to look.