I had the same problem with a Great Planes 2 3/4" spinner. It comes with Phillip head screws that screw into the spinner ok, but are incredibly easy to ream out while attempting to remove (and I have the correct size Craftsman screwdriver). I finally went to the hardware store and purchased a dozen slotted screws which work much better. I had the same problem with the screws supplied with the Hobbico Hobbistar MKIII plane. Why aren't all RC screws the HEX variety? They would seem to make the most since.