Wrote an easy guide for making Mystery 9g servos continous.
Since these servos are very cheap off ebay, or dealextreme.com
http://www.dealextreme.com/details.dx/sku.20023
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=150302752989
Heres the link for the guide:
Easy, no need for extra components. Only glue and cutting tools 