YEAZ SUP Board Manual Del Usuario página 19

MOUNTING THE FIN
Align the fin like the two fixed fins. Loosen the screw completely from the
fin. Then screw the loose screw slightly back into the square nut. This makes
it easier to position the nut in the rail. Insert the nut into the hole in the
middle of the rail. Slide the square nut into the desired position with the
help of the screw and loosen the screw completely. The nut remains in the
guide rail. Now insert the fin with the brass bolt in front at the opening of
the rail in tilted position, then straighten it up and push the fin until the hole
is directly above the square nut and fix the fin with the screw.
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