Yes i do. I used to improve the balance of my RC08 by sliding a solid vixen puck onto the secondary end of the bottom mounting rail. I will find a link to the item i used.
Edit: Here is the info on the item i used: Guan Sheng special dovetail mount adaptor FF561, A$29, from Andrews Comms. You can bolt on more weight if you need it. It's a solid billet of aluminium. if you use a Losmandy wide bar on the scope you could probably find something similiar or adapt it.
http://www.andrewscom.com.au/images/...s_dovetail.jpg