I snuck over to Rockler at lunch and guess what......the rabbit bit there is exactly the same size diameter as mine.
They told me to go to Stewmac for the whole dremel router setup.
I bought the 1/2" diameter flush trimmer bit as I think I have a smaller bearing and can do the brass tubing ring thing or a lot less aluminum tape than with the bigger bit.
It's a learning process and thats the fun of it. I have to make what I can get work and that takes imagination. No way am I gonna plunk down $86.65 for the router bit set or $100.94 for the precision router setup for my dremel at stewmac. I'm stubborn that way sometimes. Especially since I just bought the new Porter Cable router
If I have to, I'll cut the binding channel by hand. I saw the one Steve used on the headstock and although it'll take time, it is an option.