In your case seems to be the actual "worm" the one with damage and not the "gear". It would be worth to research if the part numbers are the same.
"If everything seems under control, you're just not going fast enough"
River City Bimmers BMW CCA
2005 X3 3.0i
ZPP, Htd seats, Htd strng, Black Sapphire on Terracotta.
1995 ///M3 Coupe
, Lux, MT, Htd seats, Cosmos Black on Black.