Well, why could you use this? i personally have not gotten used to the rotary being on top of the pad. i feel that the machine is blocking my view when i am polishing. With the extensions it lifts the machine away from the pad and i can see my work better. i know others have used smaller backing plates (bp) with the extensions when correcting paint under roof racks. These extensions allow you to get closer and right on the paint with smaller size bp and pads. One other thing the can help is that you only need to have one machine when you have extensions. why well you put on an extension to reach those areas you normally use the smaller machine. Sometimes having the machine away for the
backing plate allows you to maneuver around side mirrors better then with the machine right on the
backing plate too.