VPI 2nd Pivot for 3D

Due to the variation in thickness of the LP the geometry of the cartridge/tonearm changes significantly, enough to produce 1/10 degree change in geometry in some cases. Don’t they have on-the-fly geometry adjustment gizmos?

Sloppy language @geoffkait "geometry" typically refers to the alignment of the stylus relative to the preferred arc and (absent gross off center issues should not vary disc to disc ('tho the truly anal might switch chosen geometries depending on the disc they are playing and where they want to put the maximum distortion 😉))

what you describe would affect the VTF/SRA/VTA relationship which while an important part of cartridge setup is not usually thought of as geometry. Plus it's easily addressed via adjustment of whatever VTA mechanism you're using

Ah, so you're saying vertical tracking angle is not geometry. Interesting. 

Dear @geoffkait : Yes, it's geometry and affects the alignment set up.

The VTA/SRA is changing continuously at each and over the LP side due to those  macro and micro waves in the LP but we can't do nothing about. So, we stay with the choosed alignment. It's a non-evitable trade-off.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

FWIW, I was re-reading all of these posts. The OP's initial thread post reminded me of my experience when going from my VPI Classic 3 Sig SE/3d arm to my Townshend Rock 7/Funk Firm FXR, using the same cartridge.