That's interesting. It seems they have a new option of getting the terminations welded on.
You should inquire to them if they have made any slight changes to the design of the locking banana plugs over time and that you had trouble trying to get them into the binding posts and so have others that ordered recently. I am using them with Axiom speakers a few different receivers and a variety of other speakers without any issues than what I noted above. I purchased mine a few years ago so maybe they are different now?
PS: The spade lugs are useless.
