I see people spinning up there starters then jamming them onto the spinner quite often. It's something that shouldn't be done at all. The prop should just be rotated clock wise until the piston is at the top of the stroke then the starter placed on the spinner then hit the starter button. I have seen a few flooded engines end up with bent rods when the starter is spinning then put onto the spinner. Usually the spinner screw breaks first but it's not something to count on.