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Official Q&A: VRC 2020-2021: Change Up
706: Optical Shaft Encoder Designation
What is the legality of cutting a support hole off on a shaft encoder?
Would this fall under R22 or R23?
<R22> No modifications to electronic components are allowed. Motors (including the internal PTC or Smart Motor firmware), microcontrollers (including V5 Robot Brain firmware), extension cords, sensors, controllers, battery packs, reservoirs, solenoids, pneumatic cylinders, and any other electrical component or pneumatics component of the VEX platform may NOT be altered from their original state in ANY way.
<R23> Most modifications and repairs to non-electrical components are allowed. Physical modifications such as bending or cutting are permitted and may be done to legal VEX Robotics Competitionmetal structure or plastic components.
No, this would not be legal. A sensor is an electrical component, and cutting a hole in an electrical component would be a definitive violation of R22.