I have attached four photos to help identify the window and part. The window glass appears to show the Andersen logo with the letters XI at the base, the number 9 on the left and the figure 7H on the right.
The crank says Andersen Windowwall and the number 108 on the crank bar. There is also the letter L to the right of the word WindowWall, but I can't see anything else.
Lastly, I include a photo of disengaged worm screw and crank mechanism.
I live in downtown Brooklyn and would love to know where or how I can get a replacement for this mechanism, and get my window up and working again!
Thank you

