What is this ring on my motor?

I’m just curious as to what this ring at the base of the shaft of my motor is and what is its use? And can I remove it? - to make space for mounting my motor plate to it

Circlip, keeps the shaft in place, don’t get rid of it.

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Okay cheers

Sometimes u can omit it depending how u load the motor and on a board with pulley there’s little axial pulling so the magnets are usually enough to hold the rotor in place and u can remove it. An rc plane would be a different story. U likely are fine removing it and might show that the rotor magnets and stator teeth are not ideally aligned if without it the motor rotor ends up in a slightly different position in relation to the other part. If it makes more noise w it off that’s bad

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