The crank/handle is plastic through and through which is probably why it simply wore out. It is 3 1/4" long. The outside diameter is 14/32". The inside diameter is 10/32". KINRO is written on it. It belongs to a window in my shed.
Dave Sr. from SWISCO responded:
September 13, 2016
Thank you for contacting us. The longest handle we have that is also similar to yours is our 39-121, which is 3-1/8". Look it over and see if you could get this to work. We also have crank extensions for this kind of handle that you can see here.