The rivets would most likely be pop rivets that have a pull pin up the middle of them to pull the blind end of rivet into a head. The pull pin breaks off inside the rivet once tight. The pull pin that is left in place doesn't hurt anything.
When dealing with pop rivets, my normal method of removal is to drill of the head with bit that is the body of the rivet. Just the head so very shallow. Once loose a push with a screwdriver to pull it off the rest of the way works or carefully with a small chisel or putty knife. I don't personally like to grind them off or chisel as that can stick them worse sometimes.
Once the head is off it is best to use a lightly smaller pin punch to punch the remaining rivet and pull pin out to the inside. This will leave the proper size hole for the new rivet or screw. Drilling a pop rivet out is likely going to mess up the hole or not work because the bit hits the stuck pin which just spins without cutting. Even if the pin is not there as soon as the head is loose, the rivet itself may spin and never get drilled.
If the hole does getting messed up, drill a new one next to it and seal the old one up so get good rivet hold.
|