Well Darkseid, after dealing with lowsy HPI pulley fences I have learned that before assembling the drivetrain you need to "test" the strenght of the fences first. I to origioanlly placed the fences on backwards, but when I looked at the pulley it looked wrong, so I began to take it apart and when it came apart quite easily I knew it was wrong. Why the manual has the discrepency I don't know, I can only assume that the diagram was to make sure people didn't try to use the wrong part, and they also assumed that most builders would take one look at the fence and see the rounded edge should go in. Actually if the pulley was molded with the fence on the opposite side they wouldn't even need a fence on the resultingly (is that a word????) empty side.