The most impactful mod I've made to my SL-1200 MK2 was upgrading the feet. These are the ones I have, but there are other options - https://www.mnpctech.com/products/technics-sl-1200-sl-1210-turntable-isolation-feet-four
After that, using Zupreme headshells.
I also put some fo.q tape on the tonearm and have the fluid damper and rca cable mod. The table came with the rca mod, so I can't speak to how much sonic difference that made, but it's nice to be able to use better cables than stock.
After that, using Zupreme headshells.
I also put some fo.q tape on the tonearm and have the fluid damper and rca cable mod. The table came with the rca mod, so I can't speak to how much sonic difference that made, but it's nice to be able to use better cables than stock.