Pantograph Heights

I am building an interurban railroad, and I want to use the nice Reading EPB coaches by Pweiser. The problem is that their pantograph is too high. I replaced it with "Pantograph aop TS12" by philskene. That is a bit too low. Could someone tell me how to adjust the height of the pantograph on the rolling stock?
 
I believe somewhere within the files of the RDG EMu's, Pweiser has posted instructions on how to change the pantograph height. But I could be thinking of someone else.
 
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