Dipstick tube question

To remove a broken stub out of the block with the engine in the car, I use a tap that will thread into the inside diameter of the tube. Early slant 6's didn't have a tube with the stop flange at the bottom. I don't remember any until mid '70's. The most important part of the installation is to get the tube installed at the correct angle so the crank doesn't hit the dip stick and clip it off.