Another thing I've done for medium ship bases that have loose ID token slots is paint thin layers of brush-on gloss varnish, testing for fit between each later. It works great, and wild probably help with pegs, too.
I only worry because sometimes pegs are loose because the hole gets cracks, so making the peg thicker with bags or varnish may help in the short term to create a snug fit, but might ultimately break the plastic piece that has the hole.