People are sure jumping on this, aren’t they? 😉
FWIW, I recall somebody (Oak maybe?) saying that the ring wasn’t necessary;
I’ve pulled them from all my airheads (’73 R75/’78 & ’83 R100s/’86 R65) with
no problems that I’ve found…
…I’ve never found or heard that it affects sealing, and it would have an
infinitesimal effect on the oil reading.