You guys are talking about two different things. There are two types used to affix the arches:



The one on the top you push in and then use a rivet gun to pull the center pin to expand the bottom and at that point the pin breaks off flush with the surface. This type cannot be removed without destroying it.

The one on the bottom, you push it in and then push the center pin in to expand it. A pry tool can then be used to pull the center pin back out and remove it.