Altering motors

We were wondering if we are allowed to alter any of the motors? :confused: For example, taking out the shaft of the van door motor and replacing it with a larger one or a smaller one.
Thanks,
Justin
#1611

**<R31> **So that every robot’s maximum power level is the same, the motors in the kit may not be modified except as follows:

It is acceptable to modify the mounting brackets and/or other structural parts of the motors (output shaft, housing, etc.) as long as the electrical system is not modified and the integral mechanical system of the moving parts (bearings, bushings, worm gear output stages, etc.) is not changed or removed.

The gearboxes for the Fisher-Price, and Globe motors are not considered “integral” and may be separated from the motors. FIRST will not provide replacements for parts that fail due to modification.