Try a few searches in this forum using various forms of OS BGX-1, BGX, etc. I found a few. Here is one.
http://www.rcuniverse.com/forum/m_25...tm.htm#2547602
I 'inherited' a BGX-1 (and a bunch of other good stuff) a few years ago when a friend quit the hobby. Hope to put it in a plane some day. He had it in an Ultra Sport 1000.
Terry in LP