My problem is that I have thouroughly dissasembled and cleaned the blades, but they still require more oomph that I think the little spring can put out reliably. The way this shutter is designed, they rub against the housing quite a bit and I would like to reduce that friction.

so... do I need to 'spray' a little graphite between them and leave a little 'dust' there for it to work? -or do I have to rub it onto the blades and then blow the excess dust away?