The ornamental design for a flat-headed clamp for use with slotted cutter guide, as shown and described.
FIG. 1 is an isometric showing of one side of the flat-headed clamp for
use with slotted cutter guide of my invention which is posed to engage
the internal lower slot of an elongated cutter guide, the latter being
shown in phantom as not being part of my invention.
FIG. 2 is an isometric view of the other side of the flat-headed clamp of
my invention.