How can i prevent an ADS from slipping off?

I have built a very simple ADS right now.
Wrapping around my member a theraband and another one a few times folded 90 degrees to it.
Like this:

lil1’s Simple ADS Tutorial

And then i let it pull down to my ass or to the side or to the knees.

Each time the same problem:

I have theraband, however the whole construction slips off.
I am using very little force of pull.

My penis is 6 cm long in flaccid.

I dont want to wrap any tighter because this would cause a circulation trouble…..

Do you have any ideas?

You could try a different type of strether like:

New Stretcher Contraption
Piet’s homemade stretcher
Piet’s stretcher variation

or buy one like the penimaster and use SWM’s upgrade:
The Ultimate Penimaster Mod. Thanks BIB!