Micro Seiki DDX 1000 takes 3 arms
Steve at VAS has one, saw it, didn't see it operate or hear it.
Advantage, not too deep like my JVC PL-2, wider solution
Lots more technology going on than meets the eye. Track system with 'locking' plates for arm mount and location. Unique motor lifts weight of platter force on bearing. Two 1/4" plates in plinth, built in a/b box for choosing side or rear arm, thus only 1 cable out to preamp or phono stage.
I helped a member here find/buy/set it up.
We got two Micro Seiki Arms, right side short, rear long
JVC Victor Plinth CL-P3 (3 removable tonearm boards)
After I squeezed my 3rd arm on the 2 arm Plinth, I found out about the very rare CL-P3.
Eventually, excitedly I found one in Hong Kong.
Sooooo close to buying it, then luckily I asked seller to measure the distance to the far corner of the main right side board. He send me a photo with a ruler from spindle to corner.
Turns out, it was less than the CL-P2 distance and would NOT fit my 12.5" long arm.
In order to keep the plinth smaller, they changed the shape of the tonearm boards, cutting a curve to move in closer to the TT81. In just enough that my arm would not fit. Left armboard also has the curved arm board to keep plinth smaller.
I just found a CL-P3 for sale, showed it to a friend I met here, he bought it. He will pick arms that fit.