Ron, thanks for taking the trouble to post those clutch spring compressor tool images. It's very helpful, and will probably save me from another nasty screw up.
No problem Danny. I'm sure if you present the spring and nut and my pictures to someone with a lathe, he will soon make the ring. You could probably hack away at an old piston yourself
On the same topic. Hans has posted some pictures on the technical page of his way of doing it under a pillar drill. Ron