The buyer is 100% at fault here, but you're in a tough spot Larry. Sounds like he is unreasonable enough to hit you with an undeserved negative if you don't meet his ridiculous terms.
If it were me I would try to reason with him again, but wouldn't cave on the grading fees one bit. If he ended up leaving me a negative, I would respond with something like "Description clearly stated that the card was trimmed. Please read the entire description"
I think future buyers will read that response, and be able to see that the buyer was being unreasonable. Plus I don't think anyone will make a big deal over one stray negative with your overall strong feedback rating.
Good luck whatever you decide to do!
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