[ Warranty Document for Bamboo Yumi ]

A Bamboo Yumi needs to be watched over carefully. It may be left un-strung for short periods of time but leaving it un-strung for extended periods may cause the URAZORI (recurve) to become excessive or the shape of the YUMI to become misaligned. Such conditions may lead to a twisting of the string to the opposite side at the release and cause KUBIORE (bow breaks at the SEKIITA) or breakage at the HIMEZORI (the curvature below SEKIITA). Such damage is self-inflicted and is not under Warranty. An experienced instructor is needed to understand the proper shape of the bow, when and how long to leave the bow strung or un-strung, and the proper stringing of the bow.

Do not leave a TAKE YUMI in an area with high humidity or temperature such as a bathroom or the inside of a car. If the YUMI gets wet, immediately dry it with a soft cloth. If it is cold, warm it with a soft cloth prior to shooting.

Take care not to scratch or chip the surface area of the TAKE YUMI. The TODAKE (outer face bamboo) is especially susceptible to KOGAI (breaking away of the bamboo) if scratched or chipped.

 

[Common causes of damage and breakage of a TAKE YUMI]

• Storing or using the TAKE YUMI in excessive climatic conditions (extreme heat, cold, moisture and dryness)

• Using the YUMI excessively without periods of rest

• Leaving the bow strung or unstrung for long periods which may cause the bow to lose its proper shape

• Improper technique that causes the YUMI to twist counter-clockwise (HINERI) at HIKIWAKE (draw), KAI (full draw) or HANARE (release) due to an improper TENOUCHI (gripping the bow) or excessive strength or torque in the YUNDE (left hand)

• Releasing the YUMI without an arrow

• Scratching or chipping the bamboo surface

• Over-drawing the YUMI due to improper bow length

• KUBIORE (breaks at SEKIITA) because the string twists upon release due to:
• an improperly tied or sized TSURUWA (string loop)
• the URAZORI (recurve) is too high (over 20 cm)
• the KYUHA (width between grip and string) is too narrow (under 15 cm)
• the KYUHA is too wide (over 20 cm)
• the YUMI is misshapen