Your wheel is marked wrong.
The first quadrant (top left) is labeled both "A" and "B", It should be "A"
The second quadrant (bottom left) is labelled "C" and should be "B".
The third quadrant (bottom right) doesn't have a letter assigned. It should be "C".
The fourth quadrant (top right) is labelled correctly at "D".
Now your Before and after tdc and bdc are backwards.
BTDC should be quadrant "D" or the top right.
ATDC should be quadrant "A" on the top left.
BBDC should be quadrant "B" on the bottom left
ABDC should be quadrant "C" on the bottom right.
