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What is the special tool? What is it doing to loosen the grip caused by the tapered fit?

I have the same problem. I'll be taking the handlebars off. Expect to see that they are one tooth of on the spline. That means I may have to re-torque the "King" nut again.
More when I get done.

Sounds like a great day of ridding.

Still have 3 2wheelers
Picking up Ryker in two weeks.
76 years young. Looking forward to having fun.