How to adjust height of Eminent Technology ET-2 tonearm

Slaw wrote:  If you were satisfied with how your previous cartridge performed in it’s set-up, just loosen the arc block screw slightly and raise that assembly up to compensate for the extra thickness. Don’t re-tighten too much, which is a mistake many novices make.

Thank you! Now to further demonstrate my lack of experience, can you please tell (or show) me exactly where the "arc block screw" is?

ct0517 wrote: Bruce Thigpen designed 3 adjustment holes specifically for that purpose in the Joint..... also known as the "Gooseneck".

Unfortunately, I'm in the top of the three holes already. It was in the top hole with the prior cartridge. I need a way to pull the entire ET-2 assembly up about 3mm. With all the possible adjustments provided by this arm, I would think this would be an easy fix!

Slaw wrote: Here’s a great trick... Cut a piece of painter’s tape as even as possible, then apply it to what you think to be 4/5 mm higher on the arc block post. This gives you a removable reference point. Not much guessing. You'll only get this here.

That sounds like a great idea! Now, if I only knew how to get to the "arc block post" to use this tip!

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.

Thanks to everyone who has posted images, information, advice, and council. I've also received assistance from Bruce Thigpen, the ET tonearm designer. Short story is it's adjusted properly and working wonderfully. I really appreciate all the extremely helpful advice! I've learned a lot and have my ET-2 adjusted better than it ever has been. Thinking back to Oct 1986, I'm pretty sure my ET-2 was the first one they ever installed at my dealer. It's no wonder they may have made an error or two. I'll happily state, however, neither I nor any of my audio friends ever noticed the tiniest problem during playback. All is well. And again, thank you all for your time and effort to help me.