Pool Dawg had a lightly used Defy radial for sale. Looked like a good price to try out the shaft. When I opened the package the first thing I saw was a brass insert. I’m thinking, WTF I’ve never seen a brass insert for a radial shaft. The threads look pretty big but it doesn’t fit either radial cue I have. It also doesn’t fit my 3/8-10. It’s too big for 5/16-14. What the heck size can it be? By the time it arrived Pool Dawg was closed. I sent them an email for a return authorization.