Morgan Ohlson ) writes:

Sleeve? ...in the meaning of treading the sail over the mast?

How can I reef that?

on big boats the sail is rolled up around the mast - "roller reefing"
Look at the "Freedom" brand of cat ketches and similar boats on the Internet.
I've seen photos of it being done on a laser. No experience with it myself.
I run for shelter.

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