I do not know, I do know making an effort to help is a mistake, but, there a few things that can not or should not be done on a Japanese rifle, Most have to do with the safety and rotating the bolt. I would suggest holding the trigger down while attempting to rotate the bolt, then I would suggest removing the action from the stock and then removing the trigger group. The safety can be installed incorrectly by jumping/ force fitting, the problem creates a rub-ix cube puzzle because the safety when installed correctly aligns the bolt assembly.
There is a notch on the bottom of the bolt that aligns with a the top of the trigger, when the bolt is in a particular position or configuration the handle can not be raised.
F. Guffey
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