Interesting build for bike power

I have to love this build.  The author basically takes a bike, puts it on a stand, takes the chain off and attaches another chain with a hub that has a flywheel on it to drive another mechanical system.  It looks like the hub is from another bike wheel and the bracket for it is homemade.  Cool idea for pedal power machinery.

http://hackaday.com/2015/04/15/bike-powered-everything/