All in all there are 360 different angles the eyepiece mount can be shifted along. There are 90 degrees at which it can be tilted in 360 different directions. Getting the eypiece mount "true" is the first task in collimating a telescope.
The Flat comes next. It is likely positioned correctly within the range of the eyepiece mount's shifting movement. However it may need to be CENTERED correctly in the telescope's tube, or may need to have its beam reflecting ANGLE adjusted.