My husband and I virtually have the same bikes, except for the color. He has never had a wobble on his. I get a wobble on mine. I have found though, that I can bring it on and somewhat control it too, as long as it has not gotten too bad. It always is a surprise when it happens, it is not at all times in the same conditions. Usually only happens when you are in a slight curve going quite fast. For me, if I wiggle around in my seat - front to back - I can find the good spot that pulls the bike back to straight and not wobbling. Otherwise I gotta slow down. I only had the tank slap thing happen one time, and that was three years ago and I slowed waaaaaaaaayyyyyyy down. Never had it that bad again. I also keep the fall over in the neck tighter than HD recommended. That is what works for me. Everyone has their own tricks, if they have the problem at all. Hubbard said he put his foot out on the crash bar and stabilized his. But as for official? ,from my understanding no one is admitting that it really happens at all from the MoCo point of view. I've never been in a position though that I could not recover from it. Hope your buddy and his bike heals quickly.