Reminds me of High School. We had an aviation shop. You had to pass safety wiring before you could touch anything. Navy trained instructor would check for nicks on the wire with with a magnifying glass and tension with a strain gauge! If anything you did was book-perfect, you flunked. He demanded better. The first time I tried it, being left handed, I twisted the wire between bolts AC instead of CW. Man, that was like sticking a rectal thermometer in a pit-bull! . . I never made that mistake again.
Mr. C died of leukemia the year after he retired. In 40 years of using oleum spirits and stoddard solvent daily in huge parts cleaners, he never used gloves, never put the lid down, never ran an exhaust fan.