If the floppy sun visors need to be tighter, there's a plastic bushing that the sun visor support slides into and the adjuster screw tightens against. There are a few places in the GM parts book (I haven't looked for them in a Chrysler parts book, but know that GM has or used to have them) that list them. Don't remember quite where, but seems like for a mid-'80s Caprice. One of those "don't know they're there" type of things, until you look for them in an illustration.
You'll need a pair of needle nose pliers to get them out.
Just some thoughts,
CBODY67