TTW MOMENTUS MOMENTUS "The MONSTER" Rim Drive

I would think that with a rim drive o-ring with a durometer of about 60 slightly pressed against an 80lbs platter would cancel out any slight out-of-roundness of the o-ring. But if not, a $25K table should come with a high precision/machined O-ring.

Also, I believe that the table can be easily converted into a thread drive system.

Brf, you can think...when you start to listen&measure it can be adifferent experience. I'd not waste my resources on precisely machined copper plate without a mathing rubber surface...and we haven't touched the motor yet

I also suspect the thread/belt drive and idler/rim drive have a different physical optimum of the motor strength/platter inertia, so I doubt one can have a universal solution here, as they propose.

I would be extremely concerned with resale value, with TTW models constantly changing, obsolescence will occur quickly. TTW pricing structure is questionable as well, determining retail and 'street' price could leave a deep hole in your pocket if things don't work out. Seeing TTW's silly Jelco remodeled 'Eliminator' tonearm also brings me to question what other silliness is occurring. In speaking with Larry at the TAVES hifi show last year I understand he doesn't believe in resonance control, just tolerances and machining. This again has me concerned that his methodology is potentially flawed. Undoubtedly the machining quality is impressive, I am afraid however that it may end there...

FWIW, More than a few tonearms are made by Jelco to be sold under other brand names. I've never owned a Jelco or a Jelco clone, but many speak well of their better efforts. I am not familiar with the tonearm, but why do you say it is "silly".

If you're going to build a tt out of alu, brass, and stainless steel (and probably other metals and alloys), don't close tolerances and high quality machining go a long way toward resonance control?

My issue on the face of it would be only with the drive system.