A home owner from Massachusetts says:
June 6, 2015
Hi, I ordered a new duel arm operator part number 39-031. However the TOP arm rusted off. What part number is that? The picture is from the other window as the broken one is too far damaged to take a picture. Thank you.
Tom from SWISCO responded:
June 8, 2015
This part is known as a hinge. I think you should consider our 36-013-10, which a kit that can be used to replace both the top and bottom hinges (or left and right). See our video below on how it installs.