Oblique Angle to Zero (Tip #2195) from James Thomassen is a utility for dealing with drawings created by other sources. In this case, the drawings arrived with various oblique angles assigned to the text and the desired standard was to use no oblique angles. Load the LISP code and type FOA to get the command started. It asks you to select the text objects, and this task can be accomplished quickly using a window because a text-only filter is applied inside the code. After finishing your selection, each text object is interrogated and any nonzero oblique angles are set to zero by changing the group code 51 value.