Replacement window crank for steel casement windows, 1953 Florida house

Hi -
After almost 70 years, our window cranks are no longer working right. The teeth in the mechanism are wearing out, so we can't open and close the windows. The crank will turn, but the arm will not open and close. So, we would like to order new cranks. Can you please recommend a part? Thanks!

Hi -
I will order one and try it out.
Thank you for your help.