Phillip, it doesn't look like, at least from your pictures, that motor is reversible. At least with out further disassembly(there is most always a way). Unless you really know what you are doing I don't recommend that. Usually as mentioned in the thread you referenced, if the motor was meant to be reversed, there is a wiring diagram for doing so on the name plate or paperwork that came with it.
One of the reasons the other post didn't give a clear answer, we never got enough info from the original poster to answer his question!
You could take it to a motor shop and inquire if they can/will. "Will" being the most important! May be cheaper to just find another motor. I see them every so often on Craigslist for reasonable prices.
I have found that hand tools are the best choice when I want to make mistakes at a slower rate of speed.
I don't suffer from insanity. I enjoy every minute of it.