What kind of collar does your OB-1 have?
I have 14 cue butts I recently finished with 3/8-10 stainless steel pins. They all measure 0.840" at the joint. If you are interested I will send pics tomorrow. They range in price from $150 - $500 depending on what style you prefer. Some are full spliced with no wrap and others are birdseye maple forearms with wraps and Desert Ironwwod butt sleeves.
Thanks,
John