I have Dura Ace PD-7750 pedals. I got them used so I don't know their complete history. When they arrived, I noticed that the right pedal makes a light clicking sound when it first turns one way or the other. To me it's obviously missing a bearing ball or two. It turns very smooth, but I wonder if I should open it up and add the missing ball back in (or just replace all of them as a set).
My main problem is that I don't know exactly what the right amount of balls is without taking apart the good pedal (the left one) and counting. According to the parts lits below Shimano's exploded diagram, there are a total of 62 steel 3/32" balls for both pedals (31 each pedal). However on the actual picture I count two bearings, one with 9 balls and the other with 17. That leaves 5 balls unaccounted for. Are those just spares or is the drawing not meant to be accurate down to the exact number of bearing balls?
EDIT: Link to exploded diagram (pdf)