I feel it- I place the barrier below the stoma, and adjust and press a little hard and I am off to another adventure..  Takes time-but I don't have rolls of a tummy-so that helps.. But the feeling you will get the hang of real fast.. 

I made it up because I had a hard time cutting wafer just right without it being too tight and cutting my stoma. . I was putting ring onto wafer but it always left the tiniest gap . Having very watery output it always got through. This made a super - fit seal. 

I have a watery out put and this works for me also!  My friend at the support group told me of this and we are happy campers.. Not in the text books is it??? Have to fend for ourselves at times.. Then I show my ideas to the stoma nurse, and they are impressed. Great find huh?