We all learn something with some regularity.Okay, so now I'm totally embarrassed. My bike has a castellated nut and did not come with a cotter pin. I thought there was some magic I didn't understand!
My previous bike was a Honda VFR that has a single sided swingarm and four car-type lug nuts.
This bike's axle must have a hole for a cotter pin, and I've just missed it! 50,000 kilometers... Shudder.
Doesn't hurt to be lucky.