Pretty basic machine work for sure. I think that paper is in the shop somewhere. Maybe it needs to be framed and hung on the wall. I got them from Lee. He may have put that together.
Someone sent me a set of them one time to look at and it had that paperwork in it. It seems the best I can remember to drill down to close to the depth of the floor with a big drill bit and take a hammer and chisel it out. Then dress it up with a grinder. I guess that's how he did it.
