When you have a wear pattern that is oval, both pin and hole equal the elongation in proportion…..
Only if everything is made from the same material.
The disc is stainless steel and the carrier must be harder than the buttons because I could find no wear on either, except for where the head of the button was hitting the carrier because of the movement allowed by the worn buttons.
…So as they wear or elongate, you are moving the oval pin 180 degrees and that is back to the round of the pin, not the flatting out or elongation of that pin. But, you did not spin the hole 180 so you are half/worn/half new sides. .
I said 90 degrees, not 180.
The pins wear on opposite sides or 180 degrees apart, so when you only spin the button 90 degrees, the carrier and disc are now resting on unworn positions of the pin.
…Not a fix but a band-aid repair….
That is why I suggested it only be temporary.
…Replace disc assembly and carrier. ...
Not necessary. Just replace the buttons. Unless the chrome is peeling off the carrier (like mine is on the front), then it would make sense to get the whole thing new.
…Make sense the disc hole is elongated and the pin has close to half to a third the thickness it once had?
Nope, the buttons on our Big Dogs are solid and only the ends are chromed. All the metric scooters I have looked at have hollow rotor buttons. My buttons do not look to be worn very much, but it is surprising how much movement there was with so little wear. All the metric scooters I have looked at have hollow rotor buttons.
I found the pics of my rotor, they are blurry, but its all I have.
The rotor at rest.
The rotor pulled up.