Before insertion into the inner sleeve, the snap button assembly looks like this.
More reflexively than anything, I put a couple of coats of spar urethane on the wood part.
The pole sections were telescoped together and taped. Then I measured up 4" from the joint and drilled a radial 9/64" hole through outer tube and inner sleeve. It helps to remember which end is epoxied and which end gets the drilled hole and snap button. The head diameter of a #8 is close enough in size to a hole left by that drill that the head works as a snap button after some light file work.