Garrard 301 - Project

The Image shows the Blue Foam Sandwich, where as the Link shows the Cork Sandwich.

I have has had the Blue Foam Sandwich as a Pad with a dimension up to 12" x 12" and have used them in very similar size as per the image.

The Blue Foam in my environment used on my Support System never added anything to suggest there was a valuable and wanted to be kept influence.

I find that Cork, not Cork Sandwiched in Rubber has a notable influence on End Sound in my set up. I use Cork at numerous interfaces as a single material or as a part of a build up of different materials. 

Getting the very best out of Japanese Vintage TT's as a route through creating different Plinths, has substantial results created when the Board Material selected is a Resin Impregnated Densified Wood Board.     ; 

Some (JVC and others) Plinths are simply composite wood chips and glue with veneer, some are simply a tall frame with a thinner top layer, like that joke of a multi-layered thingy Linn is passing off, see the 3rd photo from below

https://www.paragonsns.com/products/linn-bedrok-plinth?srsltid=AfmBOorUbGXuPhinVLB6eV7NgyfGVtdFWqLHYpzdyj-NPEYdOD8A3Zgg

and some are thick with cutouts which is what I think of as a Plinth. 

The 7 layer plinths, CL-P1; CL-P2 (mine with two removable arm boards); CL-P3 (my friend’s with three removable arm boards) are solid 59mm thick plinths with cutouts, 4 layers of composite wood chips/glue and 3 layers of some compound, with real wood veneer with a finish coating (Linn should be ashamed)

I wonder how it would measure/compare to Panzerholz and Permali in the link you posted elsewhere

https://www.tapatalk.com/groups/audioqualia/damping-factor-values-t29.html#google_vignette

blue foam, cork, a blue foam/rubber isolation sandwich worked!

I suspect the cork might have worked also, it really is a trial and error.

I sometimes wish I still had my Thorens TD124 in this new location with these isolaton blocks,

but the JVC plinth is quite different than what I was given, and TT81’s bearing is nothing like the Thorens bearing which is known to transmit vertical motion. The Garrard bearing is probably similar to the Thorens which is why OP needed his isolation blocks for the final thing that worked.

like my CL-P2, from below, solid with cutouts, and proper fittings for the screws

the TT’s with floating suspension usually sit on/in a frame, and then people often put that frame on a platform, kind of like a plinth, and as OP and I needed, some isolation from flexible floors 

here’s a nice combo of a dust cover, wide frame with side board big enough for the 12" long SME arm with sliding mount, and that arm comes with a removable headshell, so easy to have a Mono/Stereo MM/Stereo MC?whatever pre-mounted in their own headshells, pre-aligned

thorens, dust cover, ready for long sme arm

It is easy to make alternate boards for other arms, even simply spin the board 180 degrees and have a mount for _______? in the same board.