I got a project guitar recently off of eBay. Mixed thoughts right now as of what to make of the build, but what I'm really confused about is the truss rod. It doesn't look like anything I've ever seen before. There's no slot for an allen wrench, and it doesn't have a nut on the end...it's just a cylinder. I think it's installed backwards, but the seller insured me that it's working. He told me that it's a "hot rod trussrod". I've attached a photo. Any thoughts?