Perimeter Ring Clamps: Yay?, Nay?, Sources??

I have a VPI Classic 4 that came with a periphery ring, which I promptly sold. It is big, heavy, and an accident waiting to happen. Maybe I’m a little clumsy. My first bad encounter happened with one more than 10 years ago when I bought one for my Classic. When I set my Benz Ruby 3 down, the ring promptly grabbed the cartridge and forcibly drew it over. Amazingly, the stylus was not bent. So, VPI sent me a higher quality SS ring with no ferrous content and that problem was solved, but I still didn’t like the overall risk of dropping it on my arm or table, plus the fact that it was hard to center. So I sold that one too. Fast forward to now: I use a VPI screw down clamp that I modified myself to accommodate the 1/4 inch thickness of my Funk Firm Achromat. It works very well. Very few records aren’t completely flattened by it. Take SME for example. They have thought about pretty much everything regarding proper LP playback - to their high standards, IMO. They don’t offer a ring clamp, but an excellent screw down clamp. That, I think, speaks volumes. As far as improving speed stability, the platter is already very heavy! The big improvement I made was to upgrade the motor to the SOTA Eclipse motor, plus I got the Condor and RoadRunner. And I run one excellent Origin Live Belt. That has made a tremendous measured and audible difference.

I have a VPI Classic 4 that came with a periphery ring, which I promptly sold. It is big, heavy, and an accident waiting to happen. Maybe I'm a little clumsy. My first bad encounter happened with one more than 10 years ago when I bought one for my Classic. When I set my Benz Ruby 3 down, the ring promptly grabbed the cartridge and forcibly drew it over. Amazingly, the stylus was not bent. So, VPI sent me a higher quality SS ring with no ferrous content and that problem was solved, but I still didn't like the overall risk of dropping it on my arm or table.

The Benz Ruby, Gullwing, and LP / LPS models have vastly stronger magnets than any other cartridge (excessively large neodymium). They can do this because the ruby coil plates aren't magnetic at all. But their magnets are insane. You're gonna have a bad time if you happen to try using ferrous hardware to mount them, or if your ring clamp is ferrous at all. I did not encounter such issues with my Clearaudio ring. But I almost trashed my LPS not thinking and using a ferrous flathead screwdriver to start mounting it lol. Fortunately it didn't slap against any delicate bits. 

High quality stainless steel is not magnetic at all.  Cheap stainless steel usually is.

It is sooo good to benefit from your collective experiences. I always do,

thanks to everyone who responded,

Elliott

mulveling, I am surprised to learn that the Benz cartridges you named would have such strong magnets, because they also have high-ish internal resistance for an LOMC, which suggests that the coils have many windings, yet the output is "low". Thus you’d think the cartridges could get by with a weaker magnetic field. On the other hand, my Ortofon MC2000, with an internal R of only 2 ohms and a vanishingly low output is probably dangerous for anyone with a pacemaker; its magnets are scary. The MC2000 inadvertently revealed to me that the Kenwood L07D platter sheet (made of stainless steel) is mildly ferrous; the MC2000 nearly committed suicide by squashing against the sheet. Since then, I had a copper platter sheet made for the L07D; better shielding of the cartridge from the motor EMI and totally nonmagnetic.