I am looking for information about parts for my diy brushless gimbal. I am using 5106-150t motors without extending shafts and I have noticed that some gimbal designs incorporate some sort of adapter to the front of the motor, like a bolt on shaft extension, which then passes through a bearing. This seems to keep most of the load on the bearing as apposed to the motor. Some of the cheaper designs just mount directly to the face of the motor instead of using the additional bearing.

I am having trouble finding the name of this part or a source for buying it. Can anyone offer some help here?