I’ve been reading the forums for quite a while now. And I think I finally have something interesting to contribute.
I got the Penimaster in the mail the other day, and while I am impressed by the overall quality, the attachment device was uncomfortable and kept slipping off. I also use the Bib hanger and believe Bib’s theory that pressure should be placed on the sides of the shaft in any stretcher design. I came up with an easy modification to the Penimaster made from a piece of 3/4” Snap-Fix PVC pipe repair clamp, $1.59 for two. The picture shows the clamp as purchased, and the finished product in place on the Penimaster. I wrap using microfiber lense cleaning cloth under theraband. I have only tested for an hour or so but so far it works great.
I will post a pick us the stretcher in action in the Members Pics forum.