Pumping
I use the enlarger 3” x 12” tube. Over 2 1/2 yrs regularly. I don’t believe that all my gains are permanent. When I lay off when I go on trips I feel slightly smaller. But I am way bigger soft and hard than before I started pumping. And I have grown to fit nicely into that tube. I started at 7” x 5” approx. Now I’m working on 8 1/2 length and I am up to 7 3/4 girth. So I love that tube. But use a good pump and gauge