I have been told (in other contexts, ISTR it was wheel bearings, or possibly re-assembling part of a Honda or Moto Guzzi drivetrain...it was a long time ago) that butterfly washers like that should not be re-used as unbending and re-bending the tabs significantly weakens them. Coulda been an 'old mechanics tale' though, as it was an old mechanic who told me...

Nice guide otherwise!