I think Clearaudio also makes a periphery ring for its TT's.
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I owned a ring made by Rudolf Bruil in the Netherlands. It made a big improvement on both warped AND unwarped records, as others have mentioned. Info on it is here:
I had to sell it when I switched to a TriPlanar tonearm. :-(
Part of the arm hit the ring before the stylus reached the runout grooves. That wouldn't be a problem with most arms however.
I'll buy another ring someday. It was worth the extra effort.