#54675, "RE: Vertical sliding Watertight Door system" In response to In response to 4
One small detail not mentioned in TTSM are the holes in the float ('z' on the patent drawing). In the event of flooding, these holes would allow the float to fill and sink after the door had closed, re-engaging the clutch and allowing the use of the hand crank.
Brad, that small rod you cirlcled in red does not seem to be present on the patent drawing. I think it may be simply a support for the pinion gear cover, and not related to the operation of the door.