However, a couple evening's worth of foot-tapping vibrated the metal pins that jingles are mounted on; and vibrated one of the pins loose during moderate playing

The pins came loose and some of the jingles flew off!

The metal pieces are affixed in place by a small metal pin, and the pin vibrated out of its slot, resulting in the metal pieces falling out

would have gave 5 stars, but the pins that hold the metal disks in are loose, I keep pushing them back in, maybe a little glue on the end will help

The pins fell out and then the cymbals went everywhere.