From what I can see it would be a relatively simple job swapping the centering cam for one with or without a center detent. It might even be possible to machine it so that it can be turned around for both options, but there might be too little space between the cam and the pedals pivot. If the cam goes all the way around the pivot perhaps it could be shaped so that by loosening the screws it can be spun 180 degrees for the alternate mode of operation? Another way would be to swap the cam and idler bearing position, making the idler bearing move with the pedals and cutting the cam in the sprung arm, and making the arm reversible with separate cam profiles on the two sides.

Last edited by Brandano; 05/31/13 10:03 PM.