Have no clue 'cause I never used a plastic hanger .
In my believe the wrapping and positioning of the hanger is the most important thing when it comes to comfort. It takes a while to find out the best way for your dick.
Anyway, materials are quite cheap, so why you don't build one your own and test it? Don't forget to exchange the chain with a plastic belt(from woven polyethylen if I remember right).
But mostly I do the Stretch with my feet while leaning back on my couch and having the feet on the table.
I do even bundled now like this. Of course with less windings as I could do manually.
Seems to pay off well.
I hang with my full 88kg on my dick! It happens from time to time and gives a nice stretch . I'm just happy we have so high-quality doorhandles here. Imagine it would break! I would have to leave my apartment from the window!