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One other thought on cracking spinners. If you don't already know, the spinner needs to be a tight fit on the plastic centering wedge mounted to the prop hub. If you can put the spinner in place and have the screw holes align with no pre-load then it's not tight enough. Shim the wedge out until the screw holes mis-align by about half their diameter, then load the spinner with enough force to insert the screws and you will have a stable spinner centered on its axis of rotation.
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