Okay here is what I am having trouble getting a grasp on. Brain not functioning today I guess.

Let's say that the balancer did slip and is off a tad. I rotate to 10* BTDC clockwise and then put on the piston stop. Now I go counter clockwise and it should stop exactly 10* ATDC when it hits the stop. Since the balancer is not likely to slip while doing this manually shouldn't it always come up equidistant on the other side of the starting point? I can see it being off a little bit just from the chain tension when one goes from clockwise to counterclockwise?