I finally figured out what the (+) and (-) really meant. Logic told me at first that you move the lever to the right to speed it up (+), and to the left if you wanted to slow it down (-). But the opposite resulted!!! :-[
It actually meant that if your watch is running too fast (+), move the lever to the right; and if it is running too slow, move the lever to the left.
Now I got it spot on!