5/16-18 or 5/16-14?Assuming, yes.
I got it from the original owner (had it so long he forgot what make it is) said he did nothing to it including the tip. That makes me believe it's OEM weight bolt.
It has the Meucci classic long furrule, 5/16 pin and hits like a Meucci. The weight bolt is my last wonder.
There's nothing in the way of marks to say what it is.
TOO tired tonight for pix, tomorrow before noon, voting #1 on my list.
Ya... got several cues that look alike, 2 near twins. 1 Phillips other this.That's the opposite of Phillips too.
I have a full set of SAE Tap & Dies in the garage.Honestly the easiest way would be to take it into a hardware store and use the little thread tester to see what it was.