Ordered this off Amazon. It was supposed to be Switchcraft. I'm thinking it's counterfeit. Everything looks OK from what I see, down to the three locking indents on the supplied jack washer. But the center contact is too tall. See the photo: The tip groove doesn't reach "hook". It's short by a few mm. Ever seen this? I can't imagine how this could be a manufacturing error at Switchcraft. (FYI - if the center contact appears a little bent in the backbone, ignore that. I tried to put a hump in it to make it work temporarily but it needs too much bend and the hump prevents inserting it into the guitar (Les Paul style heel jack hole).