Separating object data?

posted to: Laying Out UVs

I had rivets all sharing object data before applying scale, so I had to separate them. I selected them, went Object > Relations > Make Local > Selected Objects and Data, but it didn't frickin work - all the objects had the same underlying data still. So I had to frustratingly separate them one-by-one by clicking the number icon in the object data panel. Did I do something wrong, or what is going on here? Is there another key shortcut to do this?