When the wheel internal letter is able to be changed it will be laying side view out of the machine. The letter will be inside the dark blue area with the three screws. The hover zone includes the dark metal ring but not the shiny metal ring with sprocket teeth. When you are done setting the internal letter and put it back in the machine there is no visible indication that anything has changed.
If your mouse wheel is not working maybe it is some weird mouse software. Sometimes they are making something other than the normal mouse wheel output to try to do something different with web browsers. At first I expected the outside of the wheels to look different.
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