[Highlander4744]

Update: the shop air coupler is positioned same as yours Tom.  The sleeve needed some sweet talking to retract as designed, indicating it had not been used in a long time.  Attached the M style air plug and all works as advertised, hooked to the HF Fortress compressor I just picked up.  Next I will put a new capacitor on the Thomas 110 volt that is up front and then a check valve in the air doubler line. Thanks for that hint, Richard. Then finally will begin the leak locating. So far so good. Thanks all.