I have 2 black dot shafts, had a Predator 314, and have an OB-1.
I no longer really use the OB-1, but I've kept it to put on a butt for friends to shoot with.
What I use is a very low deflection shaft, with normal design: 11mm tip, 15 inch pro taper, 1/2 inch ferrule, milk dud tip.
What's it...