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original untouched intake from the "butterbee" on the a12 registry forum-you can see a star washer under that bolt where the return spring bracket is.
all the best
frank.

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If you look closer you will find that is not a washer,it is the serrations in the top side of the return spring bracket that resemble a washer.

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You are correct Sir!!

https://www.youtube.com/watch?v=Ji-cT58rgNc