If it belongs to a kit, my local store makes you bring the whole kit in to exchange. If not, they won't exchange it because they don't sell that piece separately. Kind of a dumb policy, just give me the new piece out of a kit on the shelf and send me on my way, its the same thing.
I have heard this about harbor freight can anybody verify this? I am thinking the reason they do this is that if you lost a piece they can get out of replacing it.