Feathersnake,
I used a 3" holesaw that you'd normally use for drilling a hole for a door knob. Of course, the grommet I bought was 3.5", hence the extra manual work
In hindsight, I should have just used a little rotary tool, since it's only drywall! Would have been easier and faster.
I actually do have a few wires that don't come out of the hole at the bottom, but go all the way down into the basement. I went to the basement, figured out where the wall was, and drilled upwards with a tiny little drillbit (didn't know if I'd measured right, and didn't want to run the risk of having a big hole in the living room floor). As it turns out, I measured right, and drilled a 1" hole. The floor itself is just a sheet of plywood. The bottom of the wall is a normal 2x4.
Fishing the wires is the easy part. Just drop them from the top hole, and you should be able to grab them in the basement. Alternatively, drop a piece of string with something heavy tied to it (a metal pencil sharpener works well
) first, and tied your wires to the other end of the string.
The power cord for my plasma just goes in the top hole, and comes out the bottom one, since I happened to have an outlet next to the bottom hole. I see no reason why an extension cord wouldn't work.
The pics at plasma extreme are a little old. I've now finished building my cabinet... see attachment for how things look today.
Good luck, it's much easier than you think! The whole thing took me a few hours.
Peter
