Thanks for all the advice!

As for the nocks, they are not worn whatsoever. It's just that they are two different types of nocks. Some have a small metal piece that comes out ofthe back of the arrow, then the nock. The others seem to be simply a plastic nock that goes into the arrow with no metal piece. It wasn't done willy nilly. I ordered one dozen at one time, and another dozen at another time, and am left with roughly six of each right now...