FWIW my VPI turntable came with a periphery ring and I have yet to use it. I am nervous about my cartridge getting accidentally hung up on it by my inattention. I run a fairly expensive cartridge so I will live with any warped albums. Luckily so far I do not have any bad warped albums. The worst one I sent back for a refund.
Wayne's Audio Turntable Periphery Stabilizing Outer Ring
Anyone have any reason to NOT give this a try (besides the price)? Or anyone recommend an alternative? I have great weights/clamps/mats but definitely own a few thousand less-than-absolutely-flat records, and feel like it’s a shame to be missing contact.