[Al Skierkiewicz]

Tristan,
R45 & R55 speak to modifying components that you are using on your robot, it does not speak to disassembly and using parts of the component. As to using parts of the battery, I would interject that ...

<R02> ROBOT parts shall not be made from hazardous materials, be unsafe, or cause an unsafe condition.

applies in your example.

Removing parts from any motor for use on the robot does not violate the modification rule for the motors used on the robot unless you are modifying the legal motor with the removed part. Say for instance you wanted to replace a sub standard magent assembly in one KOP motor with a vastly improved magnet assembly from an XYZ motor. That is an illegal modification of the motor. Removing the XYZ magnet to use as a magnet that has nothing to do with motor operation is not illegal.
From Section 4
"In addition, another intent of these rules is to have all energy sources and active actuation systems on the ROBOT (e.g. batteries, compressors, motors, servos, cylinders, and their controllers) drawn from a well-defined set of options. This is to ensure that all teams have access to the same actuation resources, and to ensure that the inspectors are able to accurately assess the legality of a given part."
The modification rules descend from this statement.