I’ve been working on fixing this air meter and now I’m stuck. No air leaks in the rest position, but when I lift the hose lever I hear air. It’ll inflate a tire, but will be off due to losing air. I’ve replaced the main valve, copper piping, strainer cover gasket, diaphragm gasket, brass check valve retainer and O rings, check valve, replaced broken shot spring and lubricated any pivot points. Also did a leak test. See video for reference. Any advice is greatly appreciated. Thanks!