Quoted from TractorDoc:Before I install lamp sockets I want to try and address some marks on the underside of the inserts. I do not know if it is glue, manufacturing marks, or something else. . . but if you look at the blue and green inserts you can see some squiggle marks.
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My first plan is to apply some Novus on the end of a cotton swab, chuck it up in the drill, and spin the polish on the insert underside. Hopefully some improvement will be made. . . the squiggles are not so obvious when you are not looking for them. . . but I know they are there.
Try applying some naphtha on the underside. If this makes the marks disappear you can partially fill them from the underside with 2PAC.