all of it is missing.
see picture of what the external parts look like for another one high in the ceiling.
Looking to buy a whole new unit to install.
thanks
Dave Sr. from SWISCO responded:
April 20, 2018
Greeting! I think we can help with this. Take a look at our 39-379 skylight operator and compare it to yours. Let us know if you think this would work as a replacement for you!