Linear tracking turntables, whatever happened?

This has been a pretty informative thread~
For another story, I knew a guy back in Pittsburgh, where I grew up, who mounted a Vestigal arm (remember those, with the wagging headshell attached to a string which tensioned it?) to a Rabco. In theory, I guess it made sense.* In practice, I don’t remember. This was back in the mid-’70s.
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*Or maybe not, given the discussion of vertical inertia here- I don't have the physics knowledge to assess this meaningfully. 

Please tell us what Rabinow did with coat hangers to prevent a toilet from being flushed while the train was in the station. Inquiring minds want to know.

@bdp24 ,

I failed to mention that I have a Moerch DP8 that I'm planning on using with the Rock 7 at some point as well.

@slaw, I know the Moerch arms are another favorite with Rock owners, which is surprising to me given their relatively low mass characteristics. I’ve seen listings for a Townshend Audio Excalibur II arm, but no pics. I have also heard talk of a replacement for the Rock 7, but that was a couple of years ago. The table itself has been in and out of production a LOT of times over the past 30 or so years. For those who are unfamiliar with the Rock, it is intrinsically unusable with linear tracking arms, owing to the arms’ front-end damping trough, which mandates a pivoted arm.

@bdp24 ,
Using my ET with the VPI MKIV, I realized that the spring suspension wasn't optimal. I then modified that table to use Symposium Rollerblock Jrs. That was a definite improvement in SQ but still, I felt the ET needed a solid/stable support.

I use to see the ET on SOTA tts all the time. Since I've never owned one, I cannot comment. The one thing I've learned over the years is, in audio, things aren't always black & white.