Ha! I just sold my CX5M carts on eBay. Still have a pair of CX5Ms in storage somewhere in various stages of disrepair…
my hot secret was that the Palo Alto / Stanford area Craigslist could sometimes be a goldmine of old FM gear from aging mathematicians / engineers who got hyped on Chowning, bought tons of the more esoteric Yamaha FM stuff back in the day then had nothing to do with it 30 years later.