The ornamental design for a mountingplate for a hinge, substantially as shown and described.
FIG. 1 is a top plan view of the novel mounting plate for a hinge according
to our new design, the bottom thereof being substantially planar and
unornamented;
FIG. 2 is an elevation view thereof, taken from the bottom of FIG. 1; and
FIG. 3 is a side elevation view thereof, taken from the right side of FIG.
1.