....I have used this and it works, and will be using it on my son's tarp again this winter. The plus to this is that when the wind is super, super gusty or when someone snags and trips over your line at night, that cap will pop off before any structure damage to the tarp happens. Came in real hand one night when my mother had the 3am nature call and some how she got tangled in Dakota's lines We still don't know how she did that, but the tarp didn't tear.
I did this and they work great on my Exped Scout Extreme tarp. Will have pics posted after the 2nd Annual Oregon Winter Hang.