To the OP, this mat comes in various thicknesses at a reasonable price. I used Herbies mats when I had a Rega TT.
https://herbiesaudiolab.com/collections/turntable-mats/products/way-excellent-ii-turntable-mat?varia...
I have a SL1200G with Hana SL and the arm is practically level.
https://herbiesaudiolab.com/collections/turntable-mats/products/way-excellent-ii-turntable-mat?varia...
I have a SL1200G with Hana SL and the arm is practically level.