A home owner from Boston, Ma says:
February 8, 2014
Hi! I have a broken crank however I don't know what model is my window
Tom from SWISCO responded:
February 10, 2014
I would be happy to help you find a replacement for your crank, but I would need to see what it looks like. Please open your window as far as it can go and take a few pictures of it for me to look at. Even better, you can remove the operator fully from the window and take your pictures while it's removed.