Sadly failure of clutch with spring center

[Christoph]

Engine of my 29 is in the car for about 50`000 mls and
as far as i remember the clutch is about same age.

Last weekend i had a clutch failure while driving and managed to
drive home 30mls without use of clutch (without any Stop)

Investigation clarified, that one of the springs left its place
as discribed in Tom Endys superbe article (attached)

I can see that one spring is not in place.
I can NOT see the spring.

Anybody managed to unscrew the pressure-plate and get out the
spring without dismounting engine (nor gearbox) ?

Will take out engine in wintertime anyway but hope to "survive"
the season (next two weekends) without to much work (as i do not
have the time)

Thank you for your ideas