A 60 year old turntable design is still going strong!

I am not that familiar with AR, certainly not this one, just studying the exploded diagram on the video. https://youtu.be/NOlhiZ902hY?t=25  

It is not shown on the diagram but he explains that it is "suspended from the top plate" which is another thing not shown. It looks like the big "T" piece is attached to the top plate at the 3 points shown. But there is no way to tell for sure. A better schematic would sure be nice.

Fantastic turntable design. I have two.  One is my "B" system daily driver. Now, it has been souped up just a bit:  quiet DC motor; acrylic sub-chassis with cast-in bearing; thrust ball bearing; adjustable VTA mount for tonearm, and a good-but-cheap tonearm circa 1990, the Jemco.  And a Grado Black.
I am completing a thick, heavy, constrained damping base for it. 

In general superior to my Linn, Ittok, Troika, although it has its own merits. The AR showed the way for a littany of similar tables from Thorens, Linn, Logic and others.  Its fun to rung the inner platter lie a bell, ring the out platter like a bell, and put them together for a dull thud.
I would like a better way to securely attach the vinyl to the platter, but that's a common problem.
With this table and the Grado, dynamics are superb, considering that by today's hgih end table standards its quite modest.

My second AR is still in parts.

MC - its a chassis old school three point sprung suspension with rudimentary damping.  The sub-chassis hangs from the springs, which are centered on three shafts /screws.
Pretty normal design from 1950 --> 2000, and all pretty much based on Ivor's original

(above -- "classic", i sometimes hate auto"correct")