I decided to try riding brakeless. It was just my luck that the cog slippled off. So my immediate response was to straddle the frame with both legs then unlclip one foot and drag it to stop. I was able to do that, then lightly thread the cog back on with the pedals. Yesterday I decided to dr. bond glue it down. This is a temporary fix until I get the lockring tool/chaintool. The cog is Suntour brand. It appears there is no lockring installed. I am guessing the previous owner stripped the threads and didnt tell me. I'll try getting a lockringinstalled. Also I need to adjust the bearings there is a considerable griding noise. It is obviously the bearing not adjusted right. I can see that one side of the cone is a little sloppy.