Flexible tendons

On your new ones, drill a hole down the middle and put in a little 7/64 Amsteel. Put stopper knots on both sides with as little slack as you can manage. When the tendon fails, that will allow you to finish a race (or get home) without much hassle.
Do that AFTER you drill for the roll pins.

I ordered the parts number 6567K64, Urethane Hollow Core Round Belting Yellow, 5/8" OD from McMaster-Carr and tried it this morning. It' slightly under 5/8 so it's a little loose in the socket but 3 turn of electrical tape and it fits snugly. I bought 1 foot for $8.48. That's make it $4.24 for both rudder instead of $24.00 from Murray's. I can't compare the stifness since mines are really hard and I have never seen new one's but that seems okay.
And it's hollow so it will be easy to pass a cord through to do like CarolinaCatamarans suggest.
Oh! I have to tell you, it's yellow.
Bacho,
It's not a braided hose. It's 100% urethane. You may be right about the sun though. Usually the black one resist better.
We'll see.
Here's a link to the product. http://www.mcmaster.com/#6567k64/=ruq4qs
http://www.thebeachcats.com/pictures/?g2_itemId=108149
http://www.thebeachcats.com/pictures/?g2_itemId=108146
my home made tendons
Before and after
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