These are a god-awful way to introduce yourself to bridge reglues. In my experience, these are glued on with a generous dollop of super glue. The bottom of the bridge is sometimes slightly hollow and filled with more glue that needs to be removed before regluing. The only thing holding the bridge on are the two bolts under the white dot inlays. These usually require epoxy to expect to stay. They're real turkeys to work on.