RE: Engine Vibration
AP:
Try it without the spinner. If it's a Tru-Turn it is probably balanced, but the Spin-Right, Vortec, all the other metal spinners, I've not found any that were balanced out of the box, if they showed run-out with a dial gauge I didn't even try to balance, the run-out just meant they were faulty. Trash time, or send it back.
Bill.