A couple of extra things here......
For years I used a Marigo mat with discs in my SA-8260. So, of course I tried it with the first disc in the Ruby when I got it. Didn't work. The Marigo mat is quite thin, but still it was too thick. So that was that for the mat. They cannot be used in the new Marantz transports.
Then there is shipping and packing......
Always keep the original packing material!!!! You can then safely ship a player when needed. But you have to use the original packing material, all of it. Remember, most every player gets shipped, usually across an ocean in a boat then on roads in a truck. The original packing is made for this.
I used to buy used 8260 players, for parts. Ones that came with original packing always came in good condition. Ones that didn't come with original packing always came with a broken pcb, ruining half of why I was buying the player.