Jim,
I'm not sure if you can still get parts or not. (I would contact Brinly)
I personally have one (now that I did a quick search)
Anyway this disk is the cat's meow! I had a Brinly sleeve hitch gang disk and I thought is was OK.
But now that I have the Cat-0 disk it is like day and night. I don't even use the tiller any more before planting.
I'm sure this didn't help much....but I'm bored and thought I would reply.