Regards, Lewm, Islandmandan:
Lew, I tried the Saturn V, seemed to diminish that intangible referred to as "air". Resonances can be either constructive or destructive, I'm unable to support it but it seems to me the flimsy mount of the LPM series contributes a character to these carts I very much enjoy.
If I follow you correctly, the MMC20CL is line contact on sapphire, the MMC1, same, and now the Acutex 315 rebuilt with LC on sapphire, should make for some interesting listening!
Much discussion relative to resonance has been engaged in, wether to damp (at the pickup) or dump through the TA (deck, platter, LP & back to the cartridge). Spacers, isolation devices and probably the "Cartridge Enhancer" modify system dependent characteristics, there's no easy answer there. It seems I'm transitioning to Yamamoto and Ortofon wood headshells. With the variations in species there is a degree of capability to "tune" the cart to the rig, the Saturn V headshell and Grado spacer sit idle in a drawer.
Islandmandan, our fellow forumite "Frogman" has a high opinion of the Acutex 415.
Mine required attention to every aspect of setup. It is a very interesting cartridge.
Peace,