Still haven't done the drilling as I am experimenting with different sizes of rubber grommets. My problem is how to fit the grommet in the hole with the wire already threaded through it. I don't know how to pull the wire through the grommet if I put the grommet in first, since it's a very tight fit even with the wire alone, never mind with a snake or something tied or taped to the wire. Any suggestions welcome!

Rodd