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I had severely worn bobbins and the parent metal on the front rotors of my 08' Norge that at the time had maybe 30k miles on it. See this video:https://www.youtube.com/watch?v=fXtFyJE97gEI replaced both front rotors with compatible ones from a Ducati ST4 from an Ebay seller. There's a limit to how much float there should be with floating rotors.
This thread is just in time for me.My front brakes vibrate a little. 2008 Norge.I looked at the buttons and they are solid stuck.Are you sure they are supposed to turn?I sprayed PB blaster and will check in the morning.I wish they had a hex shape, so I could stick in a driver.
I install a nut and bolt through the bobbin, spray on some lubricant and spin the nut with a drill.