I will describe my issue the best I can. Outboard is a 2000 - 150 mercury 2 stroke. Tried to start it this spring and found that the starter could not spin the flywheel, motor was seized. It ran fine when the season ended. I could not ge it to spin with socket and breaker bar on flywheel nut. Put penetrating oil in all the cylinders. After a few days of trying to work it back and forth and no success I mounted a big steel plate and long handle to flywheel and got it loose. With a breaker bar and socket I can spin the motor freely - but there is a certain spot where it is will grab and stops the rotation cold. The spot is always in the same spot in the rotation. If I rotate the flywheel back and forth I can get it past the grabbing point. It doesn't always grab in a single rotation, sometimes i can get 3 or more free rotations but it eventually hits this dead stop point. Rotating the flywheel back and forth I can hear and feel something loose at the grab point. I can can get it to grab slightly but get it past this point, but I can also get it to where it won't. I can use the starter to spin the engine, but it eventually hits this spot and I have to work flywheel with breaker bar to get it free again. Somebody Help!!!I'm at my wits end and am scared something catastrophic happened