It is a VERY bad design flaw, the motor has only one bearing for its rotor and thus it can ‘wiggle’ a bit on the gearbox shaft, it get’s worse the more mileage you have. Oh btw replacing the shaft is possible, but the price for it tripled since last year August … guess after a lot of people fixing their Twizys Renault got quite greedy? It is almost better to get a new gearbox instead of just replacing the shaft.
@zaphod it depends on how bad it is, right now we are testing a small company here in Germany which is able to repair/replace the part on the motor rotor if the wear is too bad. I can ask if I am allowed to upload the manual here it is in German but the guys who created it took many pictures which help a lot!
Oh and the clunking sound does NOT come from this, what you see here is a bad design error which might lead to the Twizy not able to drive anymore.