Flaccid Bends

Hi , i have a little bit of problem with the flaccid bends.

I tried to do it yesterday but couldnt do it properly , my grip always slips from the penis (im trying to hold under the glans , just like a regular stretch)

Do you guys have any idea how can i maintain a good grip without it being too strong and without it slipping ?

I had tissue paper works I also heard if it’s slipping out of the grip your pulling to hard