The friction wheel I first created was inspired by the bike powered blender instructables from the following link: http://www.instructables.com/id/STTOO5AFGWRG4LN/ or search "How to create a smoothie making human ...
You can use any electric blender really. I will describe the process I used which can be applied to any blender. Preferably not working since if it is not working you are about to give it a second life.
One blender I tried didn't work though because I couldn't remove the top wheel from the shaft. This is the only thing that will prohibit the blender from being used- is if the components won't disassemble after trying EVERYTHING!!
I used a blender that was relatively old. I don't have a picture of it in its original state but the idea is you want a blender who's bottom can be removed and mechanical insides exposed to be modified.