Aren't all Japanese made products based on their own JIS (Japanese
Industrial Standards)? Well, at least the NIWA JIS blades work fine for
Pentax products so far, and Pentax Canada is using the same fitting blades
as well (but provided by Pentax Japan directly).
Alan Chan
http://www.pbase.com/wlachan
Welcome, Powell. It's considerably more complicated than that, I'm afraid.
I know of five commonly used crosspoint systems: Philips, JIS, Vessel, PK
and Pozidrive. There are undoubtedly others. All have varying forms for
the head and driver shape. Often you can get by with using a tool from one
system on the head of another. Sometimes this just will not work. If a
screw will not turn, the first thing to check is that you have a properly
fitting tool. Stop sniggering at the back! This does not mean that it
just goes in but that it fits with minimal gap. Often you can only do this
by trying several and comparing. I won't tell you again! Only then can
you evaluate which one is best.
