>"Enlarge the core hole near the top (by any method you want)
>YOU FORGOT TO MENTION THAT WE CANNOT
>ENLARGE THE NECK.
>HOW DO WE FIT A LARGER TOOL INTO A SMALL
>NECK? THE METHOD OF ENLARGEMENT IS THE ISSUE
Again it's not the borer..... It's the sand abrasive the borer forces around the walls and under that grinds the grooves (the fig-8 borer just touches the walls in two places at the beginning of the grinding process and when the borer is too small after some grinding another longer one is inserted until the desired depth is produced. This process continues down the core hole). If you don't like that I noticed you still have not got a scale with that drawing....... sure you can't stick your hand into it at the top with a pebble of sandstone so that a starter groove can be ground around the top by hand to begin the boring process. Again calcite (what travertine is made all of) is slightly harder than your fingernail............ quartz is about 5 times harder. Let me guess the DeWatt didn't work on limestone either?
I provided a couple of images of MM5341 so it's pretty clear how much "deviating" there is.........
I suggest you read Aston's book on rock materials and forms for stone vessels in Ancient Egypt....... it's pretty clear at this point that it's needed.
Aston, B.G. (1994) Ancient Egyptian stone vessels: materials and forms. Heidelberger Orientverlag, Heidelberg, 196.
Archae Solenhofen (email@example.com)