Mayware f4 arm measurement needed

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I have a formula 4 to repair. 
The arm tube has come loose from the "pivot ring" and I need to re fit it at the right length.

Anyone have an F4 on which they could measure the exposed length of the arm tube from pivot ring to headshell?


I am looking for the dimension highlighted in the pic below. 

"If it sounds good, it IS good."
Duke Ellington

 

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