If you don't mind taking the arm apart, use 3:1 heat shrinking tube around the arm tube and heat it up to fit snuggly.
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I use the Teflon tape tweak on my Linn Basic arm and the result is very beneficial; a noticeable reduction of resonance. BUT, the Linn is a low mass arm and I don't think the rb300 is, so results may vary.
The only drawback for me is the tonearm now is kind of ugly, but makes for a good topic of conversation.