I finally after 3 days of hell, got my chain installed on my bike now. I did adjust the tensioners and the needle marks are both at the 5th mark. I tried getting the slack tightened, I saw videos on youtube but If I keep it at the 4th mark it seems too loose, 5th is kinda in the middle, and anything further seems way too tight. A guy at cycle gear said it should be 2 fingers length but idk.. Also, i bought one of thoes motion pro chain alignment tools, how exactly does this work? I put it on the rear sprocket and im not sure exactly how to tell if the wheel is even....