Vicobold jammed — what to do?

I managed to jam a hand-fed Vicobold at the Norwich Printing Museum and can’t understand why it happened and what to do about it. The press jammed at the moment of impression, or just before that moment, and made no unusual noises — it simply stopped working and the press-mechanism would not move. The flywheel stopped, but began turning again when the clutch was disengaged. So far, all attempts to adjust the clutch, and to free the press-mechanism by lubrication, gentle persuasion, and force, have failed. Has anyone any suggestions?

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