As for mounting the engine, I prefer to drill and tap my holes either 4/40 or 6/32 depending on the size of the engine. As for spinners, all of them come with mounting instruction's. Most of them have bushings that need to be installed, according to your shaft size. The spinner back plate goes up against the thrust plate on the engine followed by the prop, followed by the prop washer, follwed by the prop nut. Then the spinner is installed and all the screws or bolts are then tightned to hold the spinner on the back plate. Good Luck, Dave