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How to remove rivets
Grind off as much of the rivet's head as possible with a grinder and grinding wheel.
Take care not to grind into the metal around the rivet.
Use a small punch and a hammer to drive the pin down part way through the rivet.

OPT: I. Follow the alternative approach of grinding up just half the head. Boiling your chip down gradually will allow the layers of rivet to come out readily, much like peeling off frozen ice cream. II. Note that this style of rivet does not have a hammer. Scrape the rest of the rivet off using a tool like a knife. III. You may have to break it off more to slide it through. Locate the pin inside the rivet to give your machine a tighter seal. IV. This creates a starter hole that will help to guide the drill bit. Select a drill bit a size smaller than the rivet.
IV.