Just picked up this pin last weekend and posted for some help. A fellow poster did respond with some pictures for me and said there are four centrifuge opto's. I can only find three in the pictures he sent and my pin has only three. There are seven mounted on my pin: three by centrifuge, two in skull ramp lane and two microscope lane. I have one opto and cable mounted to nothing plugged into an opto board hanging down inside the cabinet. That makes eight total.

Can anyone tell me or show me or have a diagram or schematic from STERN... anything...showing me where the eight opto's are supposed to be mounted? The pin does not score properly as is. Very frustrated...

Big thanks to anyone that can help...