[Mr Grumpy]

I probably won't be able to get a picture til the weekend if you need one.  I've used my superb Paint skills to describe what I did.  I removed all of the hardware that the Photocell was attached to, If I remember correctly it was two screws that attached the Photocell holder to the head. I made a very simple 'L' bracket out of sheet metal and drilled two holes into it to mount it to the head (using the same two screws).  The L bracket holes were actually oval so I could adjust it back and fourth.  Then I just double sided taped the sensor to the bracket.  Pretty crude but it worked really well, especially after I replaced the rubber bushings holding the mirror and needle.