FIG. 1 is a top perspective view of a first embodiment of a portion of an arm of a riveter showing my new design;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a rear view of FIG. 1;
FIG. 4 is a left view of FIG. 1;
FIG. 5 is a right view of FIG. 1;
FIG. 6 is a top view of FIG. 1;
FIG. 7 is a bottom view of FIG. 1;
FIG. 8 is another perspective view of FIG. 1;
FIG. 9 is a top perspective view of a second embodiment of a portion of an arm of a riveter showing my new design;
FIG. 10 is a front view of FIG. 9;
FIG. 11 is a rear view of FIG. 9;
FIG. 12 is a left view of FIG. 9;
FIG. 13 is a right view of FIG. 9;
FIG. 14 is a top view of FIG. 9;
FIG. 15 is a bottom view of FIG. 9; and,
FIG. 16 is another perspective view of FIG. 9.
In the drawings, the broken lines shown in the figures depict environmental subject matter only and form no part of the claimed design.