I plan to. I messaged the buyer as soon as I noticed the neutral and asked him if there was any aspect of the purchase he was unhappy with and what I could do to help. I also explained that neutrals are considered sub-par ratings on eBay and asked if he would be willing to revise the feedback if everything was satisfactory.
No response so far. Based on his feedback and bidding history, he doesn't seem to use eBay very often. I just hope he sees my message before it's too late for a revision.