Alright, I tried the method that I thought that I inferred (10 minutes of pumping followed by 10 minutes of clamping, then another 10 minutes of pumping followed by 10 minutes of clamping), and this seems very promising. Clamping while pumped doesn't quite make sense to me...could someone give a diagram of what you mean? You'd be leaving some of your shaft out of the tube. Is that the point?
But, pump-clamp pump-clamp produced some very impressive girth results for me, albeit temporary. I will continue on this, since it seems promising.