Insertion alignment tool
The Insertion alignment tool 
allows you to readjust the angle between the model and the bar.
For removable restorations it is important to align the model. This will determine the path of insertion for placing or removing the denture. For fixed restorations, the alignment step helps to properly position the bar within the denture and to set the construction angle.
Tip
Use the top frame of your computer monitor as a level horizontal reference. Align the case using this reference as a level occlusal plane.