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Hm, a screwdriver was never involved.
You can buy a special-purpose tool, but there is no point, as long as you have some mechanical skill. You just have to turn the little slotted circle until the shutter is cocked (when the slot and the red dot line up), about 1 turn or so. I just confirmed on my 80/2.8 CF that if the lens shutter gets triggered, it can be cocked easily with a flat-head screwdriver.