I have some interest in the cue, but I play with 13mm shafts and I DO play with all my cues- no matter what the price as i cannot see just putting a cue in a closet for life- Yes the shaft diameter is an issue for many and if you do not have Joel H make you new shafts then you are not REALLY playing with a true Hercek,IMO - and how difficult and at what price would it be to get Joel to make two new shafts at 13MM, very much so, I suspect, at a price north of $400 for two new shafts that have to be matched to the butt.
My hope is that you find someone who sees the value in the cue as it lays and has the $$$ to get your sale completed.
"ALL the Best"
Mike