Today I'm trying to install my disc brake calipers, but the bushings pressed in to the anchor plate keep popping out. When I tap on the caliper mount bolts, the bushings on the inside ride the bolt right out.
Here are the bushings I'm talking about--please ignore the springs in the photo:

Does anybody know how I can get these bushings to stay in my disc brake anchor plates? Do I need to use some kind of glue to keep them in there? Or should I delicately smash their casings in some way that makes them a tighter fit? I tried that second idea already with no success.
Thank you very much!
Robroy