screws for 39-025 awning crank operator

I have a awning crank operator that has machine screws that aren't doing a very good job of holding the crank securely against the window. Seems like the window's holes are a little to large and there's nothing for the screw to grip onto. I removed a screw from a neighboring window crank, and it was the same type of screw. It was 1/2 " long and I measured .18 " in diameter.

What are the proper screw to use? I noticed there were 3/8 pan head screws on the product page, but I wasn't sure if it was meant to be used for the crank assembly.

Thanks for your time,

Peter

Thanks Tom, that's just what I needed.