Yeah, I've fixed my share of iMacs, but I don't think that damage is going to buff right out.

Ouch.

Oh, and double ouch for my shoulder just watching that. I'm go back under the knife on my left (main) chicken wing in the middle of February. It hurts just throwing a baseball with my 11-year old. I can't even imagine how bad a 20mm thumping would hurt.
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T.K. Paker