I have a Chris Whitaker butt I'd let go. Pretty much fits what you are looking for. Has a few scars and a 3/8-10" pin. It’s 29.5” and weighs 13.7oz. There is room for weight to be added but not sure how much. Looks to have been some sort of house cue conversion that he added a little dashed ring and butt cap to. I can get more details if you’re interested.