I have come across this washer—not sure what to call it—which is securing a peg that joins two plates of metal in a parallel plain. Both the peg and washer swivel, but the washer has a central tab that seems to be sitting in a channel that goes around the circumference of the peg. I’d like to remove the washer to separate the plates of metal. Is it possible to remove this washer? If so, how? And if it is removed, can the washer be reused or would removal damage it? Thanks for any help.