The top wheel is called a “Top Winder” by Belanger. Today was my 1st time ever messing with one. The manual says it should have a “cushion regulator “ at the top wheel. But Its just a regula one there. In the picture I posted, I believe what goes into the cylinder first is maybe a check valve with a needle valve on top. You can see it was rigged at one time with a shut off valve there….I did make it work right, by taking the needle valve out at the wheel and pluging that hole. I then put the needle valve at the exhaust on the mac valve in the chemical room.. I’m not sure that’s a viable fix or just a patch It’s extremely hard to figure out why something is not working correctly when you have no idea how it’s supposed to work correctly.