Ed - yeah, it's a puzzler. The rig was tight, I tune it every year. I think I may have bumped it during a raft-up, which cracked the base, and then under the wind load it parted. I'm just hoping the RigRite parts will fit, otherwise I'll have to get the new bases fabricated.
Greg - I'll let you know the cost when all is done. Right now there is a ~4 week lead time on new rigging, as the weather has been mild and many people are out sailing! And the SF Bay is not a great place to benchmark prices, as EVERYTHING here seems to cost a premium over other parts of the US.
I was also very interested in Dyneema, but nobody local deals with it - there is an outfit in LA (
https://www.colligomarine.com/) that specialises in Dyneema standing rigging. They recommend a product called "Dyneema Dux", apparently heat treated to reduce any initial stretching. I have to say, the product looks very good - lightweight, easy to repair, and super strong.