I would imagine it has the Cuetec pin
meaning it's the same for all of them? That the new shaft fits the R360 butt?
I emailed Cuetec and got the following response for their r360 3/8 x 14 shaft:
Hello Nicholas
You would need the 20 mm
Thank you
Jeff Blackoff
Cuetec USA
Thanks for inquiring!
No problem I had saw there was two different 3/8 x14 cynergy shafts and wanted to know which one would fit on my r360 so I had emailed them a while back. Glad to help!