Good luck Otto.
Let us know if it works.

I don't know what the situation with the backs are and if they can cause a miscommunication but they have a bunch of contacts on them too. Might be something else to consider.
Don't be too rigorous when cleaning these as you don't want to bugger up any of the gold plated on there.

btw: you have some really nice work on your website. Looks like you are using that 80 f/2 very well