Thanks Demobud and James.

That is exactly what I was looking for. Just blew a full morning exploring the paths and relavant searches that your Crowder Supply link led me to. Next step will be to walk into an industrial rental place and see what they've got.

I actually did finish the job in March by pounding in 3 partial rods that add up to more then 8'. Then put it up on my web site - lots of pics and gab. It has had so many hits that I thought I would try to find out how I should have done it and then add links to the correct information and equipment. Now I'm closer, thanks to you. Even Amazon has a $2,348.57 Jet Equipment Rock Drill, but no 8' extensions that I can find. Finding specific DIY "How it works" info is difficult also, which is what I try to offer on my site.

Again, thanks.