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Joe,

The problem is probably that you have too much end play in the worm. My experience was that I had to squeeze the two bearing blocks toward each other as hard as I could with my hand and then tighten them down to eliminate the end play. The worm should still turn smoothly by hand once you do this. Then mount the opwb and motor assembly and adjust the mesh. It takes only about a 1/8 turn of the little adjustment thumbscrew to make a difference. At first I got RA motor lags. I slightly loosened the screw holding the opwb on the end away from the motor and screwed in the adjustment thumb screw a 1/8 turn at a time until I got no more RA motor lags. You might have to slightly loosen both screws holding the opwb. I discovered that you can leave the motor and gearbox slightly loose and it will tend to find its own center. I was able to adjust the end play on the end of the counter weight shaft to slightly less than the 2 mm spec. I have never done a pem pro run on my GM-8, but I get nice tight round stars consistently. Before installing the opwb I had to throw out about 6% of subs due to football shaped stars.

Steve