If you're 3/4 of a mm ahead of your "ideal spec", the AVID would only be 1/4 mm beyond where you are now. My old AT-14Sa is about a mm forward beyond the Heybrook's extreamly wide null points, because it sounds better there. I "customised" the Heybrook protractor from here by telling it my arm was 1mm longer, and it's 1.6 degrees off-set to compensate by the alignment calculator. I chose that to reproduce Quad LP's with more separation front/back, and it's superb on normal stereo LP's. I consider it a "tweek" that worked. No, I can't see 1.6 degrees, but my friend's DeWalt telescopic laser level can with ease, and that's what was used to set things, and a machinist's auto-protractor for VTA, and 2 1/2X Donagan OptiVisors, with a 250 watt halogen lamp to work by...
I consider alignment protractors like a car's front-end alignment spec's. I get the toe-in set out 2 degree's on my truck, because I'm an assertive driver, and it makes the steering more neutral and doesn't "push" on sharp curves, and reduces tire edge wear. If my "tweeks" don't work, the alignment protractor brings me back to a known set of points I can reproduce easily, and start over from.
Whitneyville I'll have to look into what your saying, however is it not true this geometry info is set in stone?
This Empire cartridge along with two other mm cartridges and head shells came with a vintage table purchase just last week.
The Advid universal set up devise was borrowed just to check set up .Lp after Lp it played very well though it couldn't approach the performance of my other table. I just thought to try the Empire in another one of my tables.
Going by the book in keeping with a specific overhang I simply found out the Empire cartridge should not be played in the Phantom arm do to the fact set up would not comply with any specific null point. Adhering to these set rules I think are for good reason Whitneyville.
Pardon me for repeating myself, even though the cartridge installed in the Phantom arm I had no trouble hitting the null points with the Advid including tracing the arc of the Mint, easily.
Once the Empire was set up using the Graham jig ,all that was needed was a gentle nudge of the protractors to target their first null points.
The Advid requires moving the devise for hitting the second null point.
The Mint no, once you target the first null point some adjustment of the cartridge in the head shell maybe required for targeting the second null point & tracing the arc.
You have no such adjustment with the Graham jig other then moving the cartridge in the head shell for one of two null point settings & aligning the cantilever.
This maybe useless information for most here and could even be totally confusing for others. It could also fall into the category of a rare occurrence only experienced by a few.
I just thought I'd share my experience with anyone wanting to use a vintage cartridge with a modern arm.
Finally, there is absolutely nothing wrong with the Advid Universal set up device, its well made with a low price compared to others on the market and I will find a good arm for this Empire 4000 and mount it on my new up and coming turntable project.