What is this piece of tin from 643 head?

Posted by pbutler on May 02, 2005 at 18:27:40:

See link of picture at bottom.

I bought a 643 corn head recently, it came with this piece of sheetmetal laying on top. I can't figure out what it is for? Looks like it is to adjust feederhouse opening but it fits on my 7700 just fine without it so I am just curious.

Thanks

Paul

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