Weapons - Yawara  (continued)
The Chizikunbo is a variant of the Yawara with a string loop designed to engage with one or more of the holder's
fingers. Normally, one uses a pair of chizikunbos - one on each hand. As far as I can tell, the weapon is associated 
martial arts of the Ryukyu Islands, specifically some lineages of Ryukyu Kempo. Our research indicates that, like
many similar weapons, the length of the weapon depends strongly on the width across the knuckles of the holder's
closed fist. We recommend 1.5 inches of extra wood on each end so a four inch wide fist will use a 7" long
chizikunbo. Note that for pupils with conditions like hemihypertrophy (also known as hemihyperplasia) which might
result from a genetic condition such as Beckwith-Wiedemann spectrum (multiple genes on chromosome 11)
where the hands are not symmetrical and may not be the same size, two different lengths of Yawara or chizikunbo are
indicated. The second variable for each individual, and sometimes, like length, for each hand, is diameter. We prefer the
range of one to two inches. Unlike Tai Chi Ruler and Tai Chi Bang, the visual and tactile appeal of the wood is NOT a
primary concern, although the wood should be smooth enough not to abrade or irritate the skin when held. Note that 
some care should be taken when striking a hard surface lest the ends of the Yawara or the chizikunbo crack or splinter.
We suggest sanding and the application of one or more coats of Varathane or any similar finish. The body of the 
chizikunbo can be cylindrical or tapered - so far I have only seen symetrically double tapered although a single taper
where one end is thicker than the other and, presumably, thicker than the middle, might be of use to some students.
Other than demonstrating woodworking skills we are not aware of any tactical advantages for an octagonal cross-section.
Likewise, square (below -  top left), cigar-shaped (below - top right) and blimp-shaped (below - bottom left) tips seem to
 be a matter of taste. I was NOT personally comfortable with the elliptical cross-section (below - bottom right).
 

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