When I’m trying to tie down a plastic tarp or some plastic sheeting over anything, the grommets often are in the wrong place. And in the case of plastic sheeting, there are no grommets. Here’s another way to get a grip on a tarp.
Gather up the plastic where you want to affix a bungee cord, hold a golf ball on the underside, and twist the plastic around the ball two or three times. Hook one end of the bungee cord behind the golf ball, and secure the other end to whatever. The tension on the cord keeps it all together.
R.W. Johnson, Costa Mesa, CA