Careful with the 3 screw holes as the plinth is low quality(price relative) which can get ruined.WOW.
Having THAT in mind, I'd think of replacing a deck. There are much better valued decks with great quality plinth. Sony PS-X7 wakes up my mind. Even stock model can humiliate RP1 for lower price paid. Upgrade to SME3009 or favorable RB250 or RB300 arm and you get champion setup.
Why people are so crazy about that glass-particle disposable decks? I'd probably recreate that plinth using acrylic instead.