Step 1: Obtain an electric blender working or not
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.
Step 2: Gain access to the mechanical insides
Sometimes the screws are concealed behind the rubber feet of the blender. Pry them out if you can't see any other access points and just to be sure there are not any extra screws behind them holding the casing in place.
Once the cover was removed, I was met with a second thick black plastic casing around the mechanical parts surrounding the blender shaft. This was also secured on by screws. I unscrewed it working odd and extreme angles due to the outer plastic case. Just bare with it and remove the wires from all the orifices : the buttons should come right out and once out you can work your drill through one of the buttons to be able to unscrew the black casing around the mechanical parts. Basically get creative and do whatever it takes to get the black casing off. Push, pull, twist - these things are pretty rugged and the plastic will take quite a bit.