What is the diameter and thread on the Pasil.4 polar scope?

Tom Blahovici

I'd like to make a plug for the place the polar scope goes into the 600e mount. I figure I might as well get some use on my new mini lathe. 
I'm thinking of delrin or brass. Anyways, Once permenantly polar aligned, I should remove the polar scope since it potentially gets in the way or wires. I'd like to if the opening
Thanks, Tom

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