I am a newbie mounting my prop and plastic spinner to my engine. The directions for my Tower Trainer 40 tell me to turn the prop counter clockwise until it fits snugly against the little knobs on the back plate. I have to assume this is while facing the engine because the instructions don't specify. If I follow those directions, though, then the screw holes for the cone don't line up with those on the back plate. If I rotate the prop in a clockwise direction, however, (which is left to right or I'm losing my mind), then when the prop meets the knobs on the back plate, the screw holes do line up so I can put the cone on...

I'm not sure if there's a mistake in the directions or if I'm just not getting it. Regardless, now I'm paranoid about the prop flying off. I guess I have three questions, then:

1. What is the purpose of the little knobs on the back plate?
2. How important is it to have the prop snug against the knobs?
3. Does it really matter what side of the knobs the prop is snug to (other than the fact that the cone won't fit as in my case) I'm certainly not a physicist, but the way it looks now, it seems like when the prop is turing in a counterclockwise direction while the engine runs, those knobs won't do anything to help hold the prop on...

Thanks for any help you can give me!