Sprocket Installation Broken Trap Door Cover.

Got sprocket on and sprocket nut nice and snug. Went to put trap door on and noticed that it was wrong type for this type of drive gear, the seal was not even close. I found another door in my stuff and it has no seal and a big crack all the way through it. Well, I guess I found the source of my one of the oil leaks I had. I will drive to Jerry"s tomorrow and see if he has another