Mark and Kim Smith wrote:

Not all valve jobs are done with the head off of the engine. So the
"C" clamp type won't work in all situations.

That's right and thank you for the link.
But I'm still not giving up. :-)
In modern cars, this tool is helpfull, if you want to replace the
packing of the valve guide. But when the "doubted" tool was built, there
were no packings. There was no reason to just remove the spring.
Well, if it was broken. But then the valve was bent and burned and had
to be replaced.

Nick
--
Motormodelle / Engine Models:
http://www.motor-manufaktur.de
Ellwe 2FB * VTM 87 * DLM-S3a * cubic
more to come ...