Thanks for jumping in DL and a good starting point.
As you go for (hopefully) the right proceedure remember that you have only one try and spoiling the processed timber is not an option
DL I take it that you are suggesting going from the outside surface on one side and then progressing toward the other side, that would be a distance of 36" , do you think that you would exit where you want to or just hoping?
Remember also that the 1" threaded rod will not bend even a little bit so the hole has to be straight and true from side to side
I am not ready to share the proceedure I took yet I need some more solutions to come in first, so lets have some more input from you guys,
