Well here's a reply from a little dog. Power assists are unbelievable aids for manual stretching. Very effective, easy to use and all round simple devices that enable the user to not only increase the force put on the penis during stretching but to also place the strain anywhere down the shaft that they want to.
They also enable expressive stretching which is massively effective. If you can get the base of the very base of the penis involved in stretches then you will hugely increase the amount of gains that can be made in a small amount of time.
Behind the balls tugging can be facilitated with a [words=http://www.mattersofsize.com/join-now.html]
Power Assist[/words] and IMO this is the absolute most effective form of manual Penis Enlargement. I also think that this larger sized [words=http://www.mattersofsize.com/join-now.html]
PA[/words] would help with this.
BTW I own and have used a [words=http://www.mattersofsize.com/join-now.html]
Power Assist[/words] since they first came out.