This one is tricky. I’ve got a customer with a Nakashima 2 hybrid. Loves it, and the shaft. The shaft unfortunately has a glued graphite extender in the butt end.
Im not sure if heat on the butt end would release the glue. I could try it.
My other option is to drill out the extender down to the shaft only.
Tough problem. Any ideas much appreciated.
-Bill

Answered question