[Bfan]

I have doe'n my share of working on these things over the years and normally there are balls going all the way "round" but for a small gap, of ether a little less than one ball or almost no gap. I don't know the exact number of balls but you should definitely not have a gap of 4 or 5 balls.
To put it in another way, you should have the whole "ring" filled with balls, but you should not have to press or squeeze the last ball in. Using grease to hold the balls in place is a good idea.