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gone-ot · 11-21-2016, 06:57 PM

...or, alternatively, use TWO flaps geared together in opposite directions: as one flap rotates UPWARD to open, the other flap rotates DOWWARD also opening...and vice-versa.

11-21-2016, 06:57 PM	#44 (permalink)
gone-ot ...beats walking... Join Date: Jul 2009 Location: . Posts: 6,190 Thanks: 179 Thanked 1,525 Times in 1,126 Posts	...or, alternatively, use TWO flaps geared together in opposite directions: as one flap rotates UPWARD to open, the other flap rotates DOWWARD also opening...and vice-versa.