Ok so my pockets sit flat on the rail as seen in one pic. Whenever a ball goes it it pivots on the two nails and lifts, as seen in the other pic. The third pic shows the two nails in red and my question is could I put a nail in the green spot? I'm worried a nail there could scratch the balls. Or is there anything else I can do? Or is this normal for these style pockets? Thanks as always!