Right, I understand, but back to original question, factory they don't have degree on the balancer, it's on the motor, now I have marks on the motor and on the balancer, which one to read?
I would check for true TDC using the numbers on the balancer, and remark your TDC reference on the timing cover. Once you have your correct TDC mark, THEN you can use the numbers on the balancer.......which I'm sure are degreed out to 40-50 degrees? Those would be much more desirable than the old marks on the timing cover.
In other words "factory" had just TDC on the balancer, but the timing cover was only marked out to + / - 10 degrees.
Now, with the degreed balancer, you should have marks on it clear out to 40-50, but (if it was accurate) you would use ONLY the TDC mark on the timing cover.
Once you get "correct" TDC you can also check the timing cover against the balancer.
If you set the balancer numbers to 10BTC against the timing cover TDC, then the balancer TDC should batch up with the timing cover 10BTC mark
Read the above sentence until you understand. This of course is "assuming" the old original numbers are correct.