Quoted from MikeO:
I have found that increasing pressure gently pulling the head relay board will release it from the glass. Obviously you have to be comfortable with the pressure you are applying without breaking anything. I have always been able to get them separated with this method.
Another approach is to take dental floss and loop it between the relay board and the glass and slowly cut through the foam padding.
Lastly, Ron's glasses are excellent if it comes to it. Ice Revue is one of the best 60's nickel plated post games.
The “gentle pressure “ approach worked.
See my adventure in post #11 above.
Thanks for your help,