GoMog also has an article.....
"hammer the spinners until they will not move with even the hardest blow of the hammer."
I had always understood the locking mechanism to be the effect of the shallow centralising taper within the spinner engaging with the outer tapper on the wheel. The locking force being achieved between the C of F of the two tapered surfaces and the elastic deformation of the outer taper on the wheel?
A smart smack yes but probably not something that you would want to beat to death and risk permanently deforming.
PS – Don’t forget to grease the outer taper surfaces to avoid friction locking.
