A Hobie 14 I purchased had fiberglass rudder pins...figured I'd just sail it 'til they got "sloppy"
one broke before that happened & I was left with trying to keep the loose rudder onboard
(still attached to crossbar) and steer home with one rudder.
A 14 doesn't tack well to begin with...imagine trying with one rudder

what a nightmare
Preventive maintenance is best you can do, and carry spare shackles, pins, a good length of line, etc.
Unfortunately, life jackets worn by most cat sailors err towards comfort, not safety.
The situation you described...being knocked overboard by the boom could just as easily result in being knocked unconscious.
The only Type pfd that comes close to keeping your head above water (in this case) is a Type I.
If sailing solo, and off shore, I'd strongly recommend erring towards safety over comfort.
Ploux79, thank you for posting great questions.
Too often we're so anxious to get our season started we cut corners to get on the water.
Best to take our time and insure everything on the boat, and our personal gear, is thoroughly checked.
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