Harmonic Balancer?

 

I know of one procedure that has to be followed.
Support engine.
Loosen bolts.
Remove mount.
Install new mount.
Tighten bolts.
Repeat as required.
Remove engine support.

 

You forgot , wash your hands and enjoy a cold adult beverage

 

Taking to shop didn't fix it. Fixed me for 142.00. but have checked with several other HHRs and my engine vibrates no more than theirs at idle. You cannot feel the vibration in the body of theirs like you can in mine.
Something is sure transferring the vibration to the body. I'm fixing to check all the exhaust mounts. Will post if I find anything.

 

What did they replace for $142.00?

 

Donbrew was the first to respond to your OP. You answered his questions, but have pretty much ignored all others.