SP-10 Mat

This is what I've used for several years on my SP-10:

Custom Design Inert Turntable Matt

http://www.analogueseduction.net/turntable-mats/custom-design-inert-turntable-matt-for-suspended-turntables-.html

You'll need the stainless steel version.

A few years ago, I purchased a replica of the CU-180 from Peter's reference. It was the last a German seller had on hand, and I don't know if he had more made. It fit the SP-10 platter perfectly, deadening the ringing at least as well as the stock mat. I topped it with an ultra light TT Weights "Supreme" mat - thin cork bottom with thin carbon top, sandwiching a composite Kevlar  fiber/carbon fiber middle layer. Beautiful clear epoxy finish. I use the lightweight TTWeights aluminum record clamp as well. The combination looks great and does the job. 

I didn't see Peter's 7/28/17 post prior to mine just added. Indeed, my CU-180 replica came from this EBay seller, and I am happy to learn that he continues to sell them. Even more thanks to Peter for again informing us of their availability!

In case anyone seeks to upgrade their direct-drive turntable plinth isolation feet, I have used the Delrin version of these for the past 2 years and am very satisfied:

http://www.ebay.co.uk/itm/Isolating-feet-for-turntables-speakers-and-amplifiers-Type-1-Height-Adjust...

Replacement neoprene "O" rings can also be had on Ebay, as they do dry out and crack/split over the years. The "O" rings are the feets' contact surface with the shelf upon which the TT sits. The cones are hidden from view by the 2 piece design.

For reference, my table is a Technics SP-10 Mk2, "Krebs upgraded" (by Bill Thalmann, who also did some preventive maintenance parts replacements on the board and added a nice orange strobe LED - Bill does great work), with a PBN Audio outboard power supply. The TT and feet are in this plinth:

http://www.acoustand.co.uk/products/acoustand-technics-sp10-mk2-mk3-obsidian-inspired-bespoke-plinth...

The workmanship of the feet is impeccable.