Anyone? Anyone? Where is Royce on this one as I am really curious as to what OB is doing?
OB is using a modified 3/8-10. I can tell you from experience that their stock shaft fits my McDermott butt, but it's a snug fit. It's not tight enough that it felt wrong, but I would personally order a shaft with 3/8-10 were I to get one for my McD. Other 3/8-10 bolts may be different, but those particular ones are tight.