Hi
Mark has them now on his site, see
https://353652584127257704.weebly.com/store/p306/Rear_Spring_Platform_Metal_Ring.htmlThe story is that the originals rot out often to the point where you have no idea that they exist, that was the case on my Spider and HPE.
Matt on here years ago had a tool made to make them which passed over to Mark. I bought two from Mark years ago for the Spider and last year asked Mark for two more. He said then he was unhappy with the tool and was having a modified one made. This took a long time to sort and he finally came back to me and said he had a pair of prototype ones which I bought. He now has the tool sorted so he can reproduce them.
Most folk do not realise that they should be there.
Here endeth the lesson…..
Peter