Rear brake issue

Hold up four fingers in front of you.
Do you see four, or eight?
(Patch Adam’s quote)
Maybe we should stop a
Trying to figure out how the bracket can damage itself (which it can’t )and perhaps wonder if the guide pins, grommets, rotor, grabby brakes etc.
Are causing the assembly to vibrate or wander around causing the marks?
 
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It looks like my answer shows up in the swing arm, the bore is no longer round.

Measuring along an axis pointing to about the rear seat - platform intersection, the bore is worn about an extra 8 to 10 thou compared to a measurement taken perpendicular.
About 808 to 810 vs about 800.

Axle diameter measures about 785 all around.

The included angle between the stopper bolt, swing arm bore and major axis of the oval is maybe 80 degrees.

So it looks like there's as much as 25 thou of room for the axle to move if the 80 ft/lb can't lock everything up tight.

At some point it appears that the axle has been shifting within this clearance possibly due to braking, acceleration, swing arm motion and imparting corresponding movement of the bracket relative to the stopper bolt.
 
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