Originally Posted by
LabRat
The shutter is held to the board by one of two means... The rear shutter threads either thread to a retaining ring that holds the board, or it looks like there is a flange is screwed down to the board, and the shutter is screwed to it... Linhof usually did this, and machined a spacer ring between so the rotation of the shutter stopped in just the right orientation with the top up...
You might have to get a very tiny amount of penetrate oil or acetone into the thread with a hypodermic needle and try rotating counterclockwise, maybe with the help of a rubber strap wrench... Sometimes freezing then warming in room temp will help...
Steve K
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