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.

You are very welcome, Denny. I'm glad it worked out for you.

For what it's worth, I have found a product I am using now to replace the foam padding that the factory originally used. I was able to get it from my local Woodcraft store. I'm finding it is working pretty well after applying it to three different games. It does require removal of all of the leftover deteriorated padding and adhesive backing from the original pads that might reside on head relay board. Obviously, be careful removing any of the residue that remains on your backglass.
https://www.woodcraft.com/products/felt-tape-brown-3-4-x-25