On 24 Sep 2010 at 15:58, Fred Cisin wrote:
  Yes
 But what I can't remember, . . .
 Was the Shugart SA400 (and SA390, etc.) imperial, and
 would Shugart SA455, (&465,475) be considered an American/imperial
 drive, or a Japanese one? 
Okay, you caught me!  Half-height 5.25" floppies (SA455, etc.) used
M3, but the FH (SA400, etc.) used 6-32.  OTOH, 3.25" drives seem to
mount with 4-40 screws.
--Chuck