OK, I've finally finished my silnylon hex fly,,, & I'm wanting to put a grommet in the nylon webbing tieouts at each end of the ridgeline. The 7/8" nylon webbing tieouts are doubled over & stitched, sandwiching the silnylon tarp ends. I've installed grommets before, but only on tarp material. The little kit I have has a tube-cutter that you place on the material & strike w/ a hammer, cutting out the hole to insert the gommet & pound closed. The problem is, my tube-cutter wouldn't cut thru the nylon webbing. What do I do? How can I install a grommet in a tougher thicker material like webbing?