Lossen the balancer bolt back up and see if you can move it back and forth. If it moves the key way is wallowed out. This will cause the balancer to shake which is probably your vibration.
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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