I have never tried it with a soft object like a sock. I do them with the [words=http://www.mattersofsize.com/join-now.html]
Power Assist[/words]. A friend of mine used to do them with one of the shipping tape rolls and said it was intense, he now has a [words=http://www.mattersofsize.com/join-now.html]
Power Assist[/words] and likes in much better.