Jim, So many Tamiya Cvd failures, and blue lock-tight no help. That tri-pod design makes the pin bend, at least flex, whenever the wheel takes a whack. Bingo, pin's out, gouging a big groove in my pretty blue (expensive) hub.
So my friend Mark says he'll do it. I watched him. Nothing different from the way I did it I could see. He's just a more gifted mechanic with torque wrench fingers. Haven't had a failure since Mark took over!
But Cal's TOP method sounds best. Does Tamiya really make such a cap? Anyone actually try the heat-shrink method?

Axle pins are 10mm, but the supplied Cvd pins are like 9.8mm. One would think the longer would work best...