A call to PolyPhaser would get an answer. They might ask you who was the Ebay supplier, or even have you send them yours. I can tell you there are counterfeits of most every RF component. I have found counterfeit parts supplied by a reputable supplier who had a dirty buyer who substituted China counterfeits. We banned the company.

And if its a legitimate part, you got a deal and a pennys worth of flat washers would solve the clearance problem.

Below is a list all the complicated government and non government products and systems that worked correctly on day 1 of its roll out .