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The last time someone asked about this, I think the consensus was the whole jack is painted. A couple of guys felt the screw was natural but, if I remember correctly, they conceded the paint was likely scraped off upon operation.
I'm sure the experts will kick in soon. Let's go, guys!
Macster, we were talking about Shark jacks, 68 or maybe 69 if I remember correctly. I forget what we decided. A couple of the guys had original unmolested jacks that they described.
I can't begin to tell you what a 67 jack should look like. If the jack now has a rusty thrust bearing on the screw with no evidence of the bearing ever being painted, I would say the natural screw was assembled into the jack after the scissors assembly was painted. No one has explained to me how the entire jack could be dip painted, and the thrust bearing remain natural, which is what I have observed.