SR222 MkII aren't just good lookers, they are quite well made. The plinth is of pretty substantial chipboard construction compared to the price competition, and the tonearm actually has a proper Grace/Lustrè/Rega-like single hole mount with large threaded nut, and includes a substantial washer, roughly the same diameter as the top plate, that allows the arm to clamp the plinth quite solidly.
If the gloss black is a bit scratched, a bit of fine polish goes a long way. You'll want to use a very fine grit polish though. 3M Hand Glaze is one I've had success with. Also Novus No. 2 plastic polish (a fine scratch remover) does wonders, perfect for lids too.
Getting back to the construction, watch this repair video and take notice of the gubbins within...