1937 Window Crank Removal
I was not successful using this type of generally available tool on my window cranks - if I recall properly, the tool was slightly too small to fit over the shoulder of the crank.
I purchased a small set of awls, two straight and two bent at 90-degree angle. These tools are approximately 4" long, and very slender. Using the right-angle tool, I was able to grab the loop side of the clip, and pull if off.
Note also that these spring clips are not "standard" for today's cars, either. The correct replacement springs clips are available at Bob's Automobilia.