I have some 12 mm fiberglass tubing obtained free from old push-together tent poles, with 3 mm hole thru the center.
It worked great with JB-Weld for the thru-bow spin connecter.

Dacarls:
A-class USA 196, USA 21, H18, H16
"Nothing that's any good works by itself. You got to make the damn thing work"- Thomas Edison