hold the key to a palm sander as you try to turn the key. that's probably much more violent vibrating than a neck massager. it worked for me.

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1982 300sd from craigslist $800 greased on one tank with NO CONVERSION in the Hot Texas Sun. (currently dead & awaiting engine damage investigation and/or longblock swap)
new daily: '03 vw 5speed jetta tdi wagon. bagged&chipped