How to adjust height of Eminent Technology ET-2 tonearm

See the Bolt in the smaller Blue Circle.

https://photos.app.goo.gl/hGcy2jPkRL7BYD7z7

It is important to try to keep the air bearing midpoint (inscribed line on casing) level with the record.
I recommend you skim through the manual to understand what the adjustments do before attempting to adjust the tonearm. The tonearm is Unique - One of Kind and for this reason you should not start fiddling with it before you understand its design.

What turntable - does it have a removeable armboard ?

ct0517 wrote: ... What turntable - does it have a removeable armboard ?

It's a SOTA Star Sapphire vacuum. I've owned it and the ET-2 since October 1986 when I picked it up at The Golden Gramophone in Akron, Ohio. The ET-2 was installed and adjusted by the dealer and has never been removed. The only adjustments I've needed to made have been to fiddle with the counterbalance weights for tracking force. I've adjusted the VTA many times as well, but that's a 'user adjustment' and not something requiring any technical know-how. Looking at the photo to which you've supplied the link, I see the blue-circled screw. I've got bad news...that screw already appears to be at the very top of the adjustment range. Ugh. I was afraid of that.
Thank you for the assistance. It is greatly appreciated.

Ideally, (that screw) should be in the center of it’s range (up,/down) when the optimum adjustment is achieved. This is key.

Referring to the link above, the 'VTA block' is equal to the "arc block". 

If you loosen that screw, and adjust the mechanism to fall in the center of it’s range.......how does your cartridge look?

This will be our starting to point

As this point, you need to have you cartridge fairly level. If it isn't,, think about all of the adjustment features previously.

Let me know.

Dave - if you really want to try out that cartridge it is a very easy fix.

It's a SOTA Star Sapphire vacuum

I believe you have a wood plinth. This means they installed the ET2 with the aluminum sub plate so that the three ET 2 leveling spikes don't mark up the finish.

Remove the ET2 from its base in whole without the cart installed. Take the aluminum sub plate to any Metal Shop (when the quarantine is over). They will cut you a thicker aluminum piece, and drill the mounting hole to match. Then you have the opportunity to set up the ET2 properly.

Any adjustments made with the current install which is at its height limits will be sub - standard, as the tonearm was not installed optimally to begin with.