Took the PTO cover off my ski today and noticed that the PTO and midshaft coupler do not sit flush against each other. There is about a half an inch gap between the two. I checked all of my motor mounts and they are ok. Now, I will add that the dude that assembled my ski was a moron, and I am thinking that this midshaft may not be correct. Are there different length midshafts? I'm not sure what else it could be. Thanks.