Some have had luck with clamping the key in a Sander's clamp and using the
vibration to help "Force the Issue".

(Hell , if it happened to me ,I'd run out to the mall and get a sacrificial vibrator
to "Gorilla Glue" to the key head.["Tye Wrap" the key to the vibrator and glop
on the "GG", let it sit overnight to set up and try your luck] )

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'84 300SD sold
124.128