That thumb screw is a good idea.Due to structures on the bottom of my benchtop, the first two dog holes in line with my tail vise had to be blind holes. Because of that, I used Veritas bench pups which are only 2 3/8" inches long. The problem with that was that when working on very thin stock (see Roubo bookstand post #7392 and clock post 7395) the pups were hard to grip in order to raise them. My solution was to put a tapped hole on the bottom of the pup for a thumb screw. Now the pup can be easily be adjusted for thin stock.
NOT QUITE WOODWORKING
AGAIN
I have a deep blind hole in the thick chop of my vise.
I drilled and tapped a hole in all my bench dogs and welded up a tee handle to be able to pull them out or to adjust them to the correct depth.


















