What about this
https://www.physicsforums.com/showthread.php?t=288393"? I myself am a huge fan of Tesla and have done quite a bit of research looking for any mention of Tesla's theory of gravity, but have not been able to find any further evidence of any such theory existing. However, at the time I first came across this post, I could have learned something of some value. This person posted a quite sane and legitimate question and was immediately shut down. Why couldn't this have been a discussion, where someone of knowledge could have given the poster a thoughtful and respectful answer? For example, it is most likely that Tesla included this theory in his released statement, but didn't have a fully developed theory. It is likely however that he may have some decent thoughts about gravity, especially considering the fact that he was also a brief student of Ernst Mach, an influential thinker on Einstein. Instead, the poster asked a question in a very decent manner and was basically told to shut up and go away by a person who was obviously not very well knowledgeable on the subject, other than the fact that we would have heard about it by now. This is a disturbing response when speaking of Tesla, because despite his highly revolutionary and well founded contributions, I haven't seen a reference to him in any textbook other than the use of Tesla units to denote magnetic field strength.
Just because PF allows a thread on a slightly fringe topic doesn't mean it's supporting crackpots. If a person hears something about a so-called fringe theory, asks a question about it, and then is shut down, how has that helped explain away these fringe theories? Instead, in my opinion, this further supports a person's idea that a fringe theory is correct against mainstream science because it is flatly ignored.
I have seen instances of where a supposed expert on PF went off on such tangents and self-indulged responses that he may as well been considered a crank in the context of the thread, but is instead seemingly worshiped.
Although, I do understand there are some instances, such as the user Nigel, in which the poster is incorrigible.