Loud rattling of the front brake disc? If there is axial gap only you can adjust with thicker stainless steel shims. If there is a big radial gap you can do nearly nothing, better to procure a new one, see Stein Dinse ABM front disc for Moto Guzzi. For rusted disc nylon rotating brush will help. For the little bores use Dremel or Proxxon equipment (well known in Germany). As long as thickness is in limit and you can adjust axial tolerances, no probelm. Otherwise procure in new. Sorry for the music, there is only small choice given by YouTube. The best out of the past 30 Saturno years. Welcome to follow some of my experiences. Your feedback is welcome. More to follow. Greetings from Garagien, HP
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