When this adapter is used in conjunction with the main bearing tool, or OE tool, the stator can remain attached to the left side case during bearing installation. This adapter is a simple time and money saver when installing the main bearing on a Milwaukee Eight® left side crankcase. The adapter has been designed with added clearance for the stator screws, which are one time use only screws. It will also guarantee that the case plug seal of the stator is not compromised resulting in a leak. Simply position this adapter on top of the bearing support on the press table.