Originally Posted by ducnut
Some floating discs have a spring-washer contained within the buttons and some don't. Just because the disc moves or rattles doesn't make it worn out. You guys are starting to sound like a bunch of Harley riders.
The spring washers help to increase the clamping stresses of the rivets.
I work with and design aircraft components. If a rivet or bolt gets slop it has zero fatigue life.
i.e. If you stick a 6mm bolt in an 8mm hole it can carry zero load. Simples.
I apologise for being too fussy. I have a syndrome called self preservation. I've noticed Hardly-Worthit drivers don't have this basic human instinct.