Quote:
Originally posted by CutiePie2000
It's a teeny tiny "bulbous' looking bead like thing that you slide onto the sharp part of the pin, just before you do up the clasp. That way, if the pin pops open, the badge will not be lost. The "bubble guard" keeps it from sliding out of the fabric (it basically anchors it to the fabric, even if the clasp should open).
Not sure if I explained it that well, but I tried! 
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Oh! I believe our newer badges come standard with these, they are really nice. The badge I borrowed most of last semester had a bubble guard on it and I'm glad it did - otherwise I would have lost it in Indianapolis.
I think it looks sort of like a small earring back, if CP2k's description didn't work for you.