Does anyone know of a source for metric screws? I'm looking for some 3.5 x .6 x 6 mm. socket-head (hex-head) screws for a European scope mount. The mount currently has slot-head screws in this size, but I'd like to switch over to either hex-head or Torx screws in the mount. Actually, the last measurement--6 mm., the screw length--is not critical as longer ones could be cut to length.