New Schroeder linear tonearm, any thoughts?

I am wondering how the effective mass can be so low as "14 to 21 gm", which was stated somewhere above. If you think of it, the stylus/cantilever is swinging the whole enchilada all the way back to the stationary pivot that bears the rotating pivot apparatus. Thus the effective mass would be the additive of the masses of the swing arm, the base and pivot assembly at the tonearm proper, the counter-wt, and the arm tube/headshell. But perhaps that is not the proper way to think of it, or perhaps the LT components are made of extremely light weight materials.

The error in my thinking: Yes, the effective mass is high in the horizontal plane, because of all the paraphernalia necessary for the LT function, but it is only affected by the masses of the arm tube, headshell, (cartridge), and counter-wt, in the vertical plane. Many tonearms are similar in that characteristic.

Hi, and this arm when properly set up (just once during installation) has a ever so slight tendency to want to move to the inner groove...a slight breath sends it on its way...if you have the stylus on a blank record...so not much mass or nearly any force needed for it to trace the grooves...

Is it absolutely level?

Hi,
The eff. mass was stated as ranging from 14-21gr. since one can exchange the Certal cartridge mounting plates for lighter or heavier types(phenolic, brass,etc...), just as on my "old" arms.
The eff. mass is only about 20% higher in the lateral plane vs. the vertical plane.
Why? Most of the additional mass(pivoting bar) is near the pivot AND the linkage isn't rigid, but the fluxlines will "bend" if accelerated swiftly(like when the lateral resonance is exited, which, for other reasons is nearly impossible in this design). At the same time, the magnet/guide bar acts a an eddy current brake.
"Conventional" linear tracking arms(not the Simplicity and some other pivoted tangentially tracking arms) typically have a 8-20 times(800-2000%) higher eff. mass in the lateral plane.....

Hope this helps :-)
Have a great weekend,

Frank