I have spoken to Bruce, he couldn't remember whether it was a factory replacement part or after-market.

However I just searched the SB 590 Parts List and found that this page has a pen amendment on it that says"Used to be nylon now alloy"
This sheet came from Rover...see the header and date.
So it must have been a factory produced part.
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2014/06/full-1147-16815-scan0136.jpg)
What a shame that they are no longer available.