Can anyone tell me if the Bally zipper flippers mechanism in Medusa is supposed to be greased on the moving parts? Mine is and I'm stripping it down for a rebuild. I didn't notice anything in the manual about lubrication of this mech and usually in pinball, we never put grease or oil on the parts. But this is an old design and it does have metal-on-metal friction. Interested in the consensus of Pinsiders.
For sure, the grease does end up getting gummy and nasty with age.