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Yes
Yes
Yes, the only wraps that don't use hishigami are styles that don't require them such as hira maki.
My silk ito is imported from Japan
I include the fuchi and kashira.
Yes, I can add a counter weight inside the tsuka core that can adjust point of balance up to 1 1/2" closer to the tsuba.
No
No
No
No
No
No