As Pete posted, it's hooked over the stop from the front.
From the driver point of view, the theromstate spring is
counter clockwise closed, winds clockwise open the butterfly:
http://www.pbase.com/dennygraham/image/112537676
Looking from the front to the back the counter weight is down in
a clockwise position and counter clockwise it's nearly straight
up and down:
http://www.pbase.com/dennygraham/image/112537670
DG


Denny G
Sandwich, IL