Outer ring - who uses and what are your findings

@invictus, if you are referring to the SME Type 20 collet clamp, it does not flatten poorly warped records as proven numerous times by my friend who owns a SME 20 with said clamp. BTW, bowed shaped records are merely a small sub set of warped records.

@brf There is no collet on the SME. I clearly explained how it works. As I told you in the other thread, please take the trolling elsewhere. 

Never tried an outer ring, I use a Mitchell eng record clamp which is supplied with a couple of different thickness felt washers to be used under the record. You can adjust the pressure of the clamp by how much you tighten it.
I have found it works very well for minimalist warped vinyl but if you have a really bad edge warp it does not help much.
Every time I look at cost of outer rings it puts me off...lol

I own an SME Model 10 as well as Michell Gyro SE. Michell’s clamping system works fine, but SME’s is state of the art. If a record can’t be flattened by SME, it should be tossed into the garbage and life goes on. It would have to be visibly warped and severely rippled on the edge. No one should be buying a record like that to begin with. No periphery ring will fix that. 

But regular edge warps are easily fixed by SME. As the clamp is threaded, the outer part of the record gets bowed towards and pressed against the platter. 

If you have any problem, or even exertion sensation, in lifting a 3-4 lbs outer ring, you should hit the gym. 3 lbs is plenty to flatten anything that's going to get there. In the Clearaudio system, the ring plops right on, perfectly fitted and centered via a lexan lip on the platter. That's less annoying to me than screwing in a threaded clamp, or fiddling with a reflex clamp. Also the vertical bearing is a magnetic suspension with 0 friction or contact along that direction, so the ring weight cannot cause any wear.