Hello All,

I have Westfield rear uprights these take the Sierra half shafts and hub nuts. I need to know what size are these as the 41mm is a bit loose and the 40mm is tight - or do I need to knock the 40mm on with a hammer or is it some wonderful AF size.

Thanks for looking and for any replies.
Shindha

I had the same issue so I filed the flats on the nut to suit the socket I had. 40 mm.

Should be 41mm