Brake Disk Holes

Mabey I’m giving bad advice but if I had that problem I’d drill out one of the holes to 15 mm. If that caused a imbalance I’d drill another hole on the opposite side of the disc. Cue indignant outrage. JJH

Have you ever tried to drill a motorcycle brake disc ?
 
I honestly cant remember. I'm sure I did. God knows I've gunterd enough things in my charmed life. I have a small pillar drill. Years ago some discs were made of cast iron. Is there a issue? JJH
 


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