Hi Bjorn, look you come under
growers, it works like this there are
growers and showers, 2 guys, guy 1 his p***s when slack is only 1 inch, and guy 2 has a slack p***s of 5 inchs, but when both erect they have 6 inchs, hence growers and showers, I do hope this explaines it.
Good Luck
ps there is a site if I can find it I will come back.