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Yep, that's what I had on originally. But an Allen socket head rather than a bolt. Same washer though.
Alan.

Hmm.

Mine's definitely a conical/dished washer, not flat, and the scanned Saturno parts book I found a while ago lists it as p/n 319421 "Spring washer".

Its conicality is slight, consistent with the same style of spring washers retaining the cam pulleys and the alternator/ignition rotor. So the tension it produces is probably only a fraction of what I see specced for 4mm thick belleville washers in catalogues.

It was secure for 10s of thousands of km of fairly hard use while it was done up to snug/firmly seated, but came undone in fairly short order after it had been done up to only 60 Nm as per the manual.

I'm going to take a punt on the manual being correct for the multi-washer arrangement but not for the the single, thick spring washer.

Now that's interesting. The thick washer on mine, the one that came off, I'm 99% certain was just a flat washer, has someone in the past substituted this for the correct one?. A good thread actually, anything that will prevent the same thing happening to anyone else is good in my book!
Alan.