Hi Folks, Just rebuilt my valve, but am puzzled by the big empty space between the aneroid chamber (disk) and the lever that controls the valve position.
Heater valve photo, Hi-res

Is there a piece missing? Can anyone help me find the piece? The disk feels like it has some air pressure in it, so I guess it is OK, but I can't believe it would expand enough to fill this gap. I guess the valve will work this way, but it will be all or nothing. Can someone educate me here? Thanks in advance. Tom

http://www.volkmanns.org/1952_gmc_pickup.htm