What joint pin?

[Belford]

What joint pin is on the McDermott rear extension.

 

[Belford]

Engage Cue Extensions by McDermott

The Engage Cue Extension adds 11 inches to the length of cues featuring our new Engage butt plate system.

www.mcdermottcue.com

 

[Belford]

McDermott doesn't even know. They said that they have receive the question before and there supplier has not revealed the size.

 

[Stellar1024]

What joint pin is on the McDermott rear extension.View attachment 900484

Lol wth .. that things ugly and I have no idea.. it looks like maybe 5/16 x 14 threads... Maybe? That's a total guess..