Hi Folks..
Originally Posted by familyman
You can thread on a track cog. BMX cogs are either built into the freewheel or slide on BMX casette hubs. Neither is what you're looking for. For a bit of extra security you can screw the track cog on your hub and then after then screw on a BB retaining ring (or so I'm told, never tried it) and put some blue locktite on it.....
....The reason that your freewheel didn't need a lockring is that it would coast, hence there was no force trying to spin it backwards.
Ooops I think things got confused as to whether you were building a SS or fixed bike.
I've been reading this thread assuming you were still talking about your Centurion. If so,
for a singlespeed, you want to thread a BMX single cog freewheel (like ACS Claws) onto your hub in place of your existing cluster freewheel. There is no lockring issue for this type of setup as the freewheel prevents any reverse force applied to the cog.
For a fixed gear, you can do as familyman suggests.
I hope I didn't just make things worse
Thanks
jimv