Need some experienced eyes on removing cog/rear wheel mechanism I've looked all over the net and can't find the proper tool or D.I.Y tool to take this apart. It's a single speed (with a ratcheting mechanism), and I'm trying to take it apart to make it a fixie.

In the inner ring thingy, I counted 9 splines, and on that outer ring I counted 6 grooves. I compared all of this to park tool pictures, but did not find anything fitting. 



Home solutions and advice are welcome.
The outer ring looks like a lock ring. This should help you get it off: