I just bought a O.S. 46 LA and a 11 x7 wooden prop (they didnt have any master airscrew props in that size)but I tried to put the spinner on and when I tightin it down the backplate is bowed and when I try to loosen up the prop where the backplate is normal, the prop seems to loose, what do I do and does anyone have a diagram on what order the backplate and prop and etc should go , so I know I'm not putting it on wrong