Tricky subject to find much valid data on and after looking around many of the major and not so major penis enlargement forums I found pretty much the same ... no one really knew about testicle/scrotum pumping or would shy well away from it.
I have been pumping my testicles and scrotum since around January this year in the X-40 Bathmate. I started for just 5 minutes than went to 10 minutes and now its a full set with everything else at 20 minutes.
I've noticed bigger harder bollocks and a longer hang aswell ... it looks great.
Okay than well the site I found with most information on it is http://www.pumptoys.com/lib/lib1lh.htm which has some good information on that very page with links to two pumps designed for the purpose ... however the LongJohnny setup which is the photo below is EXACTLY how my setup is in the Bathmate X-40 when I add everything inside, which tells me I was doing okay afterall and the X-40 can be safely used as a testicle/scrotum pump.
The second pump is said to take off from where the LongJohnny left off and devlop more shape and detail. Its called the Bullmaster and it looks good TBH but I wont be buying one for awhile with money needed elsewhere but it looks specialsied in what its made for.
While browsing that site I came across a photo from a member named Pukka from Finland who used the LongJohnny on his testicles. It doesnt say his routine but his package looks splendid and is pictured below.
So the point of this thread is to share KNOWLEDGE on this subject that is scarce in all honesty. You can use the Bathmate X-40 for the purpose as the first image linked here is the same setup I have but if you wanted to get more technical than the Bullmaster is a possibility perhaps.
All this pumping will enlarge the entire area over time and become permaennet like with pumping to the penis but it takes time, however I cannot see it enlarging the actual testicles because they are different than the scrotum sack surrounding it. Its explained in the site about the testicles and really the way to enlarge them is to increase testosterone levels, that gives larger testicles but my theory is that this type of pumping could lead to the testicles actually producing more testosterone and in time making them larger
I have noticed that after my sessions pumping my balls that I'm very horny indeed and can jack off and repeat several times over more than usual for 2 days after the session before it declines. To me this may possibly be a spike in testosterone levels post workout?
Enjoy and lets have more bollock pumpers here.
Note:While strictly not a Bathmate topic I have placed this thread in that forum sub-section because its what I use personally to pump my balls with.