Step 7: Testing
On my setup, I have to power it off before reversing polarity, since there is no off position on my reversing switch. My one and only attempt to do a live reversal only concluded in the motor stopping, and there is the possibility that this procedure could hurt something in the circuit if executed repeatedly. Your mileage may vary.
You can enjoy the fact that the shredding blades are all exposed, so BE CAUTIOUS, don't put anything in there, or near there, or attached to something you might regret going in there!!!