Delta "Auto Set" miter gauge info needed

A friend gave me his old Delta Auto Set miter gauge, to use on my older Unisaw I just purchased. Checking the miter gauge, I found that the face of it wasn't at a 90 degree angle to the table surface. I had to put a washer (about .040") between the bar and the body of the gauge, on the adjusting knob, shaft. My question, is there supposed to be a shim there? The saw is a 1946 model, and after getting it home and setting it up, I was curious if it would pass the nickel test I have read about. I didn't have a nickel, but it passed with flying colors with a penny. Does that count? Thanks for any help with the miter gauge, and any other helpful tips If anyone wants an old Delta tilting table saw, missing a few parts, it's your for free. I'm located in Englewood, FL
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