best-groove, you overlooked that not Lew but Nandric mentioned
AT 636 footers. I own 4 of those so even their plural exist. But
this does not imply that they are available on eBay or elsewhere.
BTW I need to clean the cover of my Obsidian each week. Those
particles are everywhere and like death unavoidable. So without
the cover the dust has choice between platter or records...