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Anne,
Regarding the rivets that you are grinding off from the inside they do indeed fit the description of pop rivets. Chopping off rivets with the 5-way tool really only works from the head end as you have discovered. The steel shank does break off when you pull the pop rivet into place but only the part that would stick out above the rivet head. The other part stays in place where it has made the back end of the rivet enlarged. When you chop off the head of an aluminum pop rivet the steel shank does not get in the way because the end of it is slightly recessed into the rivet body.
Malcolm
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