> > If you are certain that it's not the oil, then it could be an aging 
>spring.
>
>Ah, so I would need a replacement spring from a good lens, I assume.  How
>hard is it to replace the spring?  Do the blades scatter everywhere if I
>remove it?
>
>chris

I forgot, if you decided to remove the mount, try to leave the aperture ring 
untouched or be very careful. There are a tiny ball bearing and a spring 
underneath. They will jump off.

regards,
Alan Chan

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