Originally Posted by ricardo kuhn

I have a idea for you,,,

how about ussing a similar sistem like the MRP chain guide


I'm pretty sure you can move the "bomerang" forward and replace the Uretane pulleys(maybe even keep them) and secure the bomerang so the chain loads will not move it around..
with this sistem you don't need to modified the frame and just use the bottom bracket to hold the device tight .