Thank you for the replies, how much weight do you think will be enough and not too much to damage anything? I read the patent info. for the penis circle device and it says testing of the device (I presume the 10oz model) made the penis one inch longer after 8 hours per day for one year. Is this possible? Can you lie to the patent people?
I imagine that it's possible to stretch the penis with all of that tension. There's literature in the government manuals about extender results so it wouldn't be unreasonable to expect that this device also has some success.
If this is the route you're going to go try to start with their lightest weight and work up to a set amount of hours per day. Once you've mastered that, move up in weight to the next increment and start over with the time.