Manji Sai
The Manji Sai, in my opinion, is one of the more difficult weapons to learn. It is a metal truncheon with the tangs going in opposite directions. There are three kata in Oyata's system with Marvin Fankhauser being the keeper of the third.
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As my studio and its subsequent hard drives are on lock-down (broken), I found this version I recorded shortly after learning it in 1998. I would learn something in Taika's dojo or camp at the time, then come home and film myself in the dojo. This was shortly after we moved the dojo from the Northland to my residence.
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Kihon
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II (Uughushiku no Manji Sai)
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Oyata no Manji (Fankhauser)

Taika never gave us a name for Manji II so everyone began calling it simply 2 because it was the second Manji Sai kata. Taika said he would tell us the name when we got it right. He died with that name. Many of us believe it is Uhugushiku no Manji Sai as it has a lot of similar motions that are found in Uhugushiku no Sai.