[Frankie4Fingers]

the groove in the shaft and the fan housing is secured by a half moon metal key

your came out when the fan got loose.   i agree with richard i really dont think that shaft is damaged.  it is too hard.  and the fan housing is soft aluminum

looks like this.  but not the same dimensions.  this is illustrative only

tom

If mine came out, how do I replace it?  I didn’t see that as part of the fan replacement.