I agree with you: do not damage your collectables.
Note that I have never tried this:
- cut away the styrofoam to accomodate a slider or the reverse of a button hole badge.
- reinforce the cut with a |_| piece of carboard with the sides glued to the styrofoam
- cut a horizontal slit in the felt to get the slider in
- cut two slits "+ shape" to get a button hole badge in
- fill the gap between cardboard and slider to make the front sit flat on the felt.
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