when I was using these...I would just make a small hole in the felt and insert the medal's pin. For medals with only a ribbon....I took the smallest sewing needle I could find and slid it sideways through the top of the ribbon into the felt & cardboard behind it.
here... I just threw these on there for example. I like Glenns alot better tho! (BTW thanks for that link Glenn!) But these were dirt cheap at "Michaels", the crafts/hobby store
They also make thinner "shadow frames" that fit documents & medals. (sorry for the crappy pics)
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Thank you so much guys! I love the displays you guys posted!