A little review about screwdrivers for opening cameras / lenses / shutters.
I bought Chinese / Japanese / French and in that order are the bad, the good and the awesome.
I detail, the precision screwdrivers I found on eBay from China has some kind of strange precision, but just in the label, not in the final product at all, they are dull and with defects.
The Japanese ones, from 0.8 to 2.3 plus two jigs. The cross jigs are fine, the slotted (flat) 0.8mm till 1.2mm are fine, but the others are too often to thick for some large screws at the compur shutter. The best thing of these ones are the rubber around the metal helps you to apply more torque.
The French (I recommend the ones with AF standard, slotted/flat) are just the right tool, before I had them I could find some rebel screw and suffer, now Im pretty confident using them and no screw resisted so far. The 3mm one is a star, blue or purple shine and the best part is you can add the rubber from the previous screws if you need it, so far I had no need.
Of course two French AF are the price of the Japanese ones, but for this kind of jobs are an investment or an insurance of a web done job.
I hope this can help others.
More variants from you are welcome!