Clamping is all I Use for girth work and my girth has exploded through the roof. I started of at 5.5 after a couple years of jelquing but not measuring. I am now 6.25-6.5 inches of girth. HOWEVER, i do not use cable clamps. There is no way im putting that on my dick. Check out myhardwear.com. I use their penis jelquing rings and they are freaking awesome. I started gaining girth so fast that my first pair ripped on my dick once. Check their site out.