I just picked up a Lotus 3000R. It wasn't shifting well and I identified the issue. The adjustment screw that keeps the pulleys from pulling up into the freewheel does not fit against the frame nub (see pictures). It looks like the derailleur seems to be in fair shape but I cannot see how the standoff screw could possibly match. I also believe the RD is original equipment.
Does anyone have any suggestions as to missing parts or other installation issues that would fix the issue? I suspect a different RD is in order (though I only have one non-index friendly one on hand). These thumbnails expand to larger pics.