Same here. This is the correct setup as the decal says 'Shift Up'.

The photos show that you are missing a screw from the metal piece (leg?) on the back-left corner of the playfield. This will allow the metal to rotate and dig into the side of the cabinet. This can also push the playfield into the opposite wall of the cabinet, causing scratches there.

Given the large amount of scratches in different places however, it's also quite likely that the cabinet isn't actually square anymore.

Is anyone able to point me in the right direction as to what hardware is supposed to be used through the two holes at the upper end of the Left Return Frame (see image below)?

left return frame

I'm doing a playfield swap and have found that a previous owner has drilled two extra holes into this piece. I have no idea why as there's nothing wrong with the playfield where the original hardware was. They've also used two different types of screws, neither of which are correct. The upper most one has a steel sleeve with a small taper on it.

I've ordered a new left return frame from Cliffy as in addition to the extra holes, this one is also beat up.

The page of the Williams Red manual that covers this assembly doesn't include the hardware for these two holes, nor does the parts list as far as I can tell.

Is this supposed to be a #6 pan head sheet metal screw with a steel sleeve of some sort? If anyone has a part number for a suitable sleeve, that would be appreciated as I haven't found anything that seems like it would be a good fit from browsing Marco, Pinball Life, etc.

Thanks transprtr4u, I didn't think to look at the posts section!

At least they’ve added the dimples now. Mine is from the first batch and the holes shown in your photos were all pre-drilled. Looks like they’ve added the dimples but introduced some other omissions in the process. Not a big deal though, you get comfortable measuring and drilling holes fairly quickly.

@nocreditdot, @monkfe, this is the one you're looking for. It's called a 'pin crank' in the parts list, but Marco has it listed as a 'bumper post':
https://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=02-4590

I haven’t tried this myself yet, but you should be able to disassemble the steel frame by undoing the bolts on the side and then slide the stick out the front, which will then free up the black plate.