Sorry! I mis-understood that you were actually speaking of the vacuum-switch. Mine was completely missing from the transmission,where it is usually located,(at least on the T.F.-style-trucks.) I have a couple of late-'40's Studebaker 2-tons,that have been sitting for years,and decided to mount one of the units to the fire-wall,which makes it super-easy to "plumb-into the vac-line from the intake manifold. I have a spare vac. switch from a '49 Stude,if you're interested. I've tested it ,and it DOES WORK!! I'm not posting it for sale,as it is my spare,but if you want it,send me a P.M. B.T.W... I was a rubber-roofer for 15-years,and Goodyear,Carlisle,and several other manufacturers RECOMMEND cleaning mating surfaces with gasoline! This is the only solvent they recommend. Since "gas" evaporates almost as soon as you apply it,I don't see how this would damage the rubber,in any way. The diaphragm is in an air-chamber,also free of any gear-oil contamination,unless you have a serious vent issue in the axle-housing.
