Thanks, kindly, Dutch. I finally got one right after a hundred or so wrong guesses.
In a way, this reminds me of the Plymouth Trouble Shooting Contest I was in in high school. Every year, every Southern California high school would send two auto shop students to the Los Angeles Plymouth plant where maybe a hundred identical cars had been jiggered-up with the same engine problems. A couple of the problems I always remember were the wood block jammed under the fuel pump arm and (sorta like the washer) no copper in the phony 12V wire to the ignition coil. We came in 5th place (no ribbon).
Anyway, just glad Crispin can happily ride his A10 until the next challenge.
Richard L.