Raul, Nice story, but it's a little hard to believe. You and your scientist friend are in a lab playing records and watching the stylus with an electron microscope? This was at normal speed and slow motion.
You can't see a record groove with an electron microscope unless it's painted with conductive coating. Vinyl is an insulator. Must have been a pretty big scope to fit the record player. Check this out:
www.youtube.com/watch?v=GuCdsyCWmt8
Even if your story is true, it's an anecdote about one particular unnamed pair of tonearms. You think there are better arms than the 507 II. Okay we get it, but not everyone agrees with you. I read 2 reviews of the arm and the reviewers bought it from Dynavector. Probably a decent arm?
What don't you understand about bearing friction and inertia?
Regards,