I am also into ball stretching which I started back in October. I have tiny balls and very tight scrotum. It's mad a big difference for me, and I love the way it feels. I use the WMC 30mm weight, and after having worn it for 1 month, I can now comfortable place a 1/2 leather above it for extra stretch without the extra weight. I keep them coated with cocoa butter or omega 3-6-9 oil all the time. I don't wear them when I leave the house, but always when I am at the house. I also pump my balls with the
Bathmate, it makes them huge. I recommend pumping your balls before your cock though. It's crucial that you get the right internal diameter size weight, else you will just keep slipping through it. I slip through mine all the time, so I have just ordered a 25mm shaft collar from Mcmaster-Carr, but, I ordered the wrong size Hex key and have had to order another key. There are some great articles about ball stretching at secretleather.com I think Jordan Johanson is the guys name. I found that the chrome split collars were only $60 at funtoyfactory.com so that is were I got mine.
http://www.funtoyfactory.com/ball-weights-c-96_100.html?osCsid=31i7ied678uc73f04kuji3oj96
Good Luck, and have fun with it.