@richardbrand Firstly when I get confused about audio, I have a few sources I rely on that are not typically using forums, who are sought out to give me an assistance with becoming better gathered in my thinking about a certain line of thought on a matter that sticks as being of interest.
One individual who is consulted with, is through a very long Career and prior to their retiring. Become a Design Leader for electronic circuits used in vessels that are part of a Countries Defence Strategy where when deployed are solely present to defend nations. Such an individual has been the mind that designed the circuits and protections for the circuit that enables a micro Voltage current to be sent uncorrupted over 150ish metres in an environment that is for from optimum for such transfer.
An individual with such a Career and who has also run parallel with that a passion for audio experiences where Vinyl media is the Source Material for near 60 Years is a very good contact to be able to converse with.
This same person has over the years become a good friend and I visit him and his Wife a few times a years for social interaction.
Through discussion I have learnt about Ortofon, and as you have recently discovered Ortofon are not shying away from showing their Technology in a very public exhibition.
What Ortofon are not doing is sharing their IP for the assembly and function of the Cartridge, which I am totally in agreement with. They invested substantially to learn such valuable information, why should it be free issue.
My friend has a through acquiring a substantial range of Ortofon Cartridges produced across the past 25 years took the opportunity to become much better educated with Ortofon IP.
Ortofon have their own Rubber Producing Sister Company that produces Rubber Compounds for the Medical Industry. It is strongly suggested Ortofon are the most educated Company on Rubber Compounds able to be selected for a Damper Role in a Cartridge. Ortofon also produce a large range of Black Coloured Rubber Compounds, which makes it almost impossible to identify when a different compound is selected across different models.
It is also strongly suggested that Ortofon are producing Dampers Compounds that are extremely accurate and the Damper Parts are identical in properties when produced from a particular compound.
The highly polished Replicant Stylus > Bonding Substance > Selected Cantilever > Armature > Coil Winding are strongly suggested to be extremely close in their weights for each assembly for each Cartridge. The same goes for the Magnet and Poles.
The overall assembly is able to be fastened onto the Damper with extreme accuracy across Cartridges due to the extreme accuracy of each Compound used fir the Damper Part. The Tension Wires also have a methodology for anchoring them, that enables extreme accuracy to the force applied to each Damper.
The differences that can be measured across Cartridges for produced distortion that can occur through the placing of the Armature and how this impacts on the B Field / Flux Relationship is at it ultimate control when the FSE is used, as this serves as a Jig to create a extremely accurate alignment of the Armature across Cartridges, resulting in consistent distortion readings. If Ortofon then choose to leave the FSE in place, there is the optimised alignment and the effect the FSE has on the B Field / Flux, which is the next level of creating distortion readings that are much more beneficial for the End Sound being produced.
Hence, The FSE is strongly suggested as being a critical part for both Cartridges not with it as a permanent part and especially those that do have it as a part.
How other Cartridge Producers overcome the across Cartridge accuracy for Armature Alignment and applied Tension to a Damper Part. That may not be consistent in the Compound for each Damper part selected, is an unknown if they are able to meet the standards Ortofon are able to consistently create.
The outcome of such IP being utilised, is that Ortofon Cartridges as a result of being consistent in how the B Field / Flux is managed. Results in Cartridges with a a measurement with very close similarities for distortion produced and End Sound being closer to each other when heard side by side.