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Originally Posted by M. Krass
If you look at the topmost image, look closely at the shaft between the two sprockets. It ends before entering the leftmost sprocket. It's close, but close isn't good enough 
The second image shows a really quick rendition of my proposed solution. The red piece represents the extension that would be bolted into the end of the existing output shaft. The leftmost sprocket from the top view would rest wholly on the red extension piece. |
A picture paints a thousand words.
I hate to tell you this, but I just don't see any way the screw that holds the extension in place being able to handle the torque that will be applied to it. In effect, that screw will be all that is driving the outboard sprocket and it's applied load.
Now, if the extension was to have a section that fit over the shaft protruding past the first sprocket with a key way slot to drive it, no shoulder on the outboard side so the outer sprocket could then be mounted to it, and finally the center drilled through so that a screw passed through a washer , through the extension and into the trans output shaft to hold it all together, then that "might" work. Clear as mud??