Here's a heavy, but simple version, using .157 PC tubes, and Rev end caps. The black 'bushing' between the tube and the end cap is a short piece of automotive vacuum tubing, same stuff Rev slices up to make washers to keep the shock cord from pulling through the sail corners, note my mylar washers... :-)) The other end of the tube I use a nylon bushing with the lip cut off, hard to find item... a piece of shrink tubing will do just as well to bush to the Avia APA connector. 135# Spectra, I can tighten it up by adding knots to the keepers at the head attachment points.
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