With regards to OB shafts, the models designed to fit the Viking Quick Release will fit the Players cue very well.
We actually make 2 different joint configurations to fit the 5/16-18 joint pin, which is what comes in the Players cue. Our standard "18" is .830" in diameter at the joint and will fit many of the older cues made with that pin. Our "VQR" is .840" in diameter and is made to fit the Viking cues. However, the Viking cue is still a 5/16-18 pin, and the quick release portion is all on the butt side of the joint, so this shaft will fit cues with that pin. It just so happens that the Players cues use a 5/16-18 pin, and are also .840" in diameter. Making the "VQR" shafts an excellent fit.
I hope that helps!