Creative and cheap DIY turntable/tonearm tweaks

Has anyone tried experimenting with a stock Rega tonearm to see what damping it by filling it with some spray foam insulation would do to the acoustics? How about sand filled? The more acoustically dead an arm is the better I would think. There doesn't seem to be much discussion on this forum about cheap DIY tweaks - just about spending more money on the latest hyped mega-bucks mod. It seems this crowd would be more inventive than that.
The Teres table intrigues me in terms of the DIY mod possibilities. How about filling the chambers with the lead shot with a damping fluid so the shot would "jiggle" and damp vibration more efficiently. Any thoughts?