I cast these in a one pound mold I had. I used a small drill as a starter hole and just screwed in brass cup hooks.
I have 3 taped together that I use when I first put on the hanger to do my adjusting with. When I get everything comfortable, I'll start adding weight until I get to around 8 pounds for a typical 20 minute session.
Sometimes, even 8 pounds is too much, so I'll just remove weight until I can maintain for the session.
The heaviest weight I have hung with the BIB starter, (pictured) is 12 pounds.
Naw Dusty, my cat just happened to be in the picture.
Thanks Big Al, I just couldn't get that picture to size down.