I like the idea of building my own boost controller, I don't like the idea of some ball bearing and a spring that looks like it came out of a mechanical pencil to run my boost pressures up into the hi 20's for psi. I imagine at some point it wound matter how much you twisted that bolt. It would just blow that fucker open, it it would be locked closed. Not saying that it wouldn't work, just saying Joe used home made boost controllers of several different varietys. And for 10lbs, whatever it works fine. But I've had problems once your fucking around with the 16+lbs area. And with as much time I spent fucking around with trying to make them work, the best thing I did was just buy the air compressor regulator and just set it and forget it.