Could just be it was cut from a longer threaded rod section. You can get this stuff in 6 and 8 ft lengths. If there is a benefit to using more or less to balance the cue than this would be the answer IMHO. The rounded section might have been the exposed part of lets say the handle and was "finished" so it would assemble easier into the forearm.
JV
I wouldn't argue against this either. Or, they would round off one end and maybe cut a flat slot on the other hand to drive it into one piece (say the handle) and then torque the forearm to it, since you no longer need to use a screw driver at that point. Either way ,rounding one side makes sense if it's cut from a length of threaded rod.
Freddie <~~~ still looks like set screw

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