Getting screwed over on a payment for a parts purchase?

Leave the guy "Bad Feedback" on your 1st ebay purchase. Tell people he is a scammer so his ebay rating goes down and people will be less likely to buy from him.
My ebay purchase with him was almost a month ago.
That went well, no problems, issues.
I left positive feedback, at that time, as the transaction went well.
My current problem is with a private sale, between him, and me, during the past few days.