Well.... You are going to need to make one for yourself! It is a nice clean design, and not too tough for beginning braider/slinger.

Great photos are available in

WildAtHeart's review

and Snapcut gave the details (though not step-by-step) in one of his earlier posts excerpted below:

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THE WHIRLING HURLER
SPECIFICATIONS


MEASUREMENTS
RELEASE CORD  31 inches
CRADLE     5 inches
RETENTION CORD  25 inches
WRIST LOOP  6 inches (not including Matthew Walker knot)
TOTAL   67 inches (not including Matthew Walker knot)

KNOTS
Slipped Sheet Bend (used during construction)
Constrictor Knot (used during construction)
Noose (used during construction)
Four-Strand Square Sinnet
Eight-Strand Square Sinnet
Two-Strand Matthew Walker Knot

LINE USED
Nylon Twine Size #18
Nylon Twine Smaller Than Size #18 (used during construction)
Cotton Twine (used during construction)

EQUIPMENT
Work Belt
Bryson Distributing E-Z BOBS (med)
Foster TINY-SPRING CLOTHESPINS

BRAIDED CORD STRAND LENGTH
7 yards (2 Green, 2 White)

CORE/CRADLE STRAND LENGTH
10 yards (1 Green)

BRAIDING COLOR PATTERN SEQUENCE
SIDE A    SIDE B
Green     Green
White     Green
Green     White
White     White

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Everything you need is here. Start with four strands of twine 7 yards long (3-4 "armspans"). Fold them in half to find the center, and tie the strands together (I often use twist-ties). Braid about 4 inches using a four strand braid  - Snapcut used a simple round braid. This will be your finger loop.

Now fold the finger loop in half so that the eight strands come together. Tie this off again to help you keep things organised. The retention cord is an eight strand braid, you can use any pattern, or pair up the cords and braid as if fours strands (quite a lot faster!). Don't worry too much about the transition between the fingerloop and the cord. If you are tidy it will look a little cleaner, but no worries if you just launch into the cord section.

Now Snapcut was a little tricky and carried the "weaving strand" through the cords as a core for the braid. It is a nice refinement, since there are no loose ends near the pocket. If you are up to it, you'll need to set this up in advance. A simpler solution would be to add the extra strand in 6-8 inches before you get to the pocket as an extra strand "doubled" with one of the main ones and then tuck the loose end into the cord afterward. No problem if you just want to do the weaving and then use the loose ends to whip the cord attachment points either. Point here is basically that you need two strands (one for each side of the pocket) once you get there - it doesn't really matter where they come from.

The pocket is a simple over-under basketweave. The body cords form the warp, and are split first into four groups of two, then eight strands. Make the split the size you like - a good starting point is to make it just a little longer than you can push your favorite projectile through (don't worry, the stiffness prevents this from happening while you are slinging!). Back to 4x2 and then round braid until the end.

It sounds like a lot, but it isn't too tough to figure out. The braiding might take a while at first, but the result is something to be proud of!

Matthias