Salesman, contact Spencer at:
http://greatdaytoride.com/Home_Page.phpBesides improving the comfort of the seat, I believe he can mod yours regarding the tailbone issue.
Quick turn around time and not a wallet buster.
I haven't had mine done yet, but know 2 people who have. They say the change is fantastic. I sat on the one friend's BA, I could feel the difference just sitting on it.
Jim F