Getting screwed over on a payment for a parts purchase?

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.

You are definitely unable to change the course of your feedback. And since it's F&F Paypal will not accept a dispute however if you chase the chain of command long enough someone may send an email or 2. And that's about it. For $113.00 there is no gain for a day in court.

You are one of the most square sellers I have dealt with. And you let your guard down. For what you lost it's a minimal loss considering what "could be!" Unless you have an established relationship with someone F&F is no longer an option for transactions under any circumstances... When someone pushes the issue I walk away from the deal. End of story!

JW