Here I have taken off the back frame of The Gearcycle and am planning on replacing it with part of a bicycle frame. This should reduce energy loss since the frame is stiffer and has a bicycle bottom bracket as a gearbox. There are too many steps and it is too complicated to list everything here. Check out my posting The Gearcycle Part 1 for basic instructions on how to make The Gearcycle.
Here is the video along with this posting: http://www.youtube.com/watch?v=KUDpLjS-9CI.