Does anyone know how to unassemble the bolt after it has been assembled in the wrong position in order to make the bolt inoperable?

Currently the large round "knob" at the back of the bolt has a knob that hits the receiver frame so the bolt cannot be cycled. I believe they used to do this for safety reasons when shipping the guns back to the states? Apparently there is a way to "jump" the knob back into the correct position, so the bolt can function normally. This gun has been handed down through the family, and is in great condition...mum intact!
Thanks for any input!
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