I'd be hesitant to run a pump without a shaft since that is the one piece that is truly keeping it centered... But I'm a skeptic and I know what happens when something is going 9k rpm and the crankshaft is not balanced. Things lock up and things go kaboom
Anyways, luke33 in one of your pic, is the air line somewhat pinched right at the venturi? Don't you think that is restricting the air going into the pump?
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