To update this thread, I bought a radial pin schmelke from the billiard warehouse for $165. I compared it to a genuine (by eye) and the pitch looked dead on. A radial predator brand shaft screwed on fine.
Unfortunately, the cue is a complete pos. The stock shaft tip comes off the table about 1/8” per revolution. The pin visibly wobbles if I roll the butt by itself. When I screw on the radial predator shaft, the joint is non-concentric by a mile. (It is concentric with the stock shaft). The predator shaft tip flaps 1/2” like a fish. The rest of the cue is pretty bad too.
I have one more on order custom made 60” long for me. I’ll report back if it’s same/better/worse.
The cue I bought isn’t worth $50 imo.
I didn’t even know a cue could be made this crappy.