Think clock face for the balancer. Balancer turns clockwise looking at it from front.
tdc mark at 12:00. The tape goes on with the btdc markings going towards 1:00.
The idea for a timing tape is using the 0 mark on your marker/timing cover. If you think about that, if you put your tdc mark at 10 BTDC on the balancer, where would the mark on your balancer be to use the 0 mark?
Read that post I linked, it explains how to mark your balancer at 15 and 30 BTDC.
The explanation in those instructions is correct, ATDC will be to the left of your mark, BTDC to the right. When advancing, the mark will disappear up under the water pump.
