I could be wrong…. The other studs could have stretched or come loose from the strain. Who knows for sure what happened at this point. I blame the builder but we are all human. Had I built it myself, there could have been something missed. Now that it’s all in the past, I am going to tear it down, inspect everything and put it back together over the winter. When the tracks open, I’ll be confident this car will run a number that I will be happy with.