Yikes!! OMG is right - having to rebuild any diamond cantilever is twice as costly. I religiously use a metal outer ring (Clearaudio), but am extremely careful and aware of the risk it can pose, especially with certain tonearm setups.One of the biggest disaster stories I know was not even caused by a cleaning party. By some hardline habit of using a metal outer ring which a specific tone arm had some physical constraints in terms of space at the end cut or dead wax area, one part of arm hit the ring and caused the arm to literally dribble and bounce on the vinyl. Result was a missing stylus, and it was a Diamond cantilever Tiger Eye. When I asked for a rebuild quote from my regional distributor, his first words was OMG !!!
My lone incident was a few years ago, with a girlfriend touching the table when told not too (she was angry at me lol). Yep, the stylus ended up dribbling across the vinyl, and a missing stylus was the end result - the boron cantilever wasn't bent at all and looked perfect. At least it wasn't a diamond cantilever model (Onyx Platinum). I can live without a cleaning lady, and the current girlfriend would never do that sort of thing