Posted by Bob in North GA [67.140.199.191] on Sunday, July 01, 2012 at 23:33:27 :
Our nearby Tractor Supply has a 49 dollar gadget that will supposedly open a stuck grease fitting (zerk) without removing it. You fill this cylinder with penetrating oil that has a coupling on one end for the zerk and a piston with rod on the other. You tap the piston rod with a hammer and hydraulic force is supposed to clear the passage. Sounds good.
Do they work?
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