Originally Posted by integerspin
I have to strip an Olympus and clearly the precision screwdrivers I have are not right. They are a cheap japanese set bought in the 70's and I guess they are JIS. ...
That should be "aren't JIS". Your old set was likely made for the North American market and spec'd accordingly.
The Olympus camera is almost certainly built with JIS spec fasteners. The JIS Cross-point spec is quite different than the Phillips spec The JIS, and DIN, spec for slotted fasteners has thinner slots for any given slot diameter.