I'm putting together my first kit and I'm running into some trouble with the Spinner Backplate hitting the Cowl. What's the best way to bring the spinner out a 1/4 inch of so without having to move the engine. I'm hesistant to move the engine because there is already very little of the cowl left to fit around it in the front. I had to move the engine all the way back on the mounts to get it to fit already. Would a large washer of some type work??