Describe the procedure for universal or protruding head rivet removal.

1. File the rivet head to make it flat and center punch the flat surface for drilling. 

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2. Use a drill bit one size smaller than the rivet shank to drill out the rivet head. 
3. Drill the rivet to the depth of its head, while holding the drill at a 90° angle. Do not drill too deeply, as the rivet shank will then turn with the drill and tear the surrounding metal. NOTE: The rivet head often breaks away and climbs the drill, which is a signal to withdraw the drill.
5. If the rivet head does not come loose of its own accord, insert a drift punch into the hole and twist slightly to either side until the head comes off.
6. Drive the remaining rivet shank out with a drift punch slightly smaller than the shank diameter.

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