I have an old sprocket off of a 1970's Ultra 10 speed road bike. I was able to get the sprocket off of the axle, and want to disassemble it in its entirety to gain access to the cogs. It has a 12 tooth cog on the top, which means the lockring is behind that (I think).. Disassembly by destruction is fine with me.. Don't have a chainwhip, just a basic set of tools and chainbreaker. Any advice on how to take it all apart?