Is this dangeous?

Did manual stretches for a year without any results, so I decided to give hanger a try, but instead of buying one I just grabbed an old sock, a 1kg dumbbell, tied one side to my unit, and used it for 1 hour straight, at first there was pain, but now I kinda feel like my unit adapted to it and that I learned how to tie the sock in a better way, I do this one hour straight, 5 days on 2 off, after 6 weeks I took a decon week like ToughtfulGold stated in his scheduled trauma theory, I gained 1,5cm, my unit has gone from 13cm to 14,5cm, that after one year or more of unsuccessfully trying JAI stretches, manual routines and V-stretches.

My primary concern is cutting off blood circulation. If you still have some circulation then you’re probably ok. Some restriction is ok, just watch for numbness and no blood flow. Pain is typically something to avoid and suggests there is a problem with your process. Discomfort is to be expected.

Always pay attention to the signals or feedback your penis is giving you.

Only pain is when I remove the sock, I just feels like I can have a dumbbell attached to my penis the whole day.

You’ll definitely feel surface pain, using a sock. I find materials like socks to be painfully abrading.