I second the top climber. They are about 250 on ebay every 6 months or so when one comes up. I use the line that comes with it, attached to the main halyard, and then a prusic knot tied to the spin halyard for redundancy. Makes me feel very secure. When there's no second halyard, I use a spare line, lineman style, to feel more secure.
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Average minds discuss events;
Small minds discuss people.
The best minds discuss sailing.