The ornamental design for a front part of a tandem roller, as shown and described.
FIG. 1 is a front right perspective view of a front part of a tandem roller showing our new design;
FIG. 2 is a front left perspective view of the front part of a tandem roller shown in FIG. 1;
FIG. 3 is a right side elevation view of the front part of a tandem roller shown in FIG. 1;
FIG. 4 is a left side elevation view of the front part of a tandem roller shown in FIG. 1;
FIG. 5 is a front elevation view of the front part of a tandem roller shown in FIG. 1; and,
FIG. 6 is a top plan view of the front part of a tandem roller shown in FIG. 1.
The broken dash lines denote unclaimed portions of the invention. Neither the broken dash line portions nor the broken dash lines themselves forms any part of the claimed invention.