"How do I... 003" - one of the MOST important safety devices on a sailboat... Running a boom-brake.

I would advise anybody with a sailboat to run a boom-brake instead of a preventer.
The boom-brake lets the boom come across slowly in the event of an accidental jibe (gybe) and results in the boat heaving-to instead of getting slammed over.
I use a climbing figure-8 instead of a brake from a 'marine' supplier. It's a fraction of the cost of a marine version, and the grade of aluminium is suitable for marine environments.
You can buy them off Amazon, eBay, a local climbing store, etc.

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