If they're not press fit or rotted in place, pull them & let 'em soak in kero for about 15 minutes & clean them out. Otherwise I just spray them down with WD40 & push the little ball in. As a last resort, I'll use a zerk-zapper. Fill it with NON aerosol penetrating oil & whack it with a hammer. It usually frees up instantly or within a few minutes. The only occasion where it didn't work at all, was where the fitting was on the load side of a hinge.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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