| No | Part |
Rule 1 (Movement) |
Rule 2 (Isolation) |
Rule 3 (Adjustment/ replacement) |
Theoretical Part | Justification |
|---|---|---|---|---|---|---|
| 1. | Knob ring
|
No | No | No | x | The knob ring is unnecessary because it can be combined with another component |
| 2. | Knob 
|
Yes | Yes | Yes | √ | This component operates as a rotating part so it is an essential part. |