The ornamental design for a tillerfender, as shown and described.
FIG. 1 is a left front perspective view of a tiller fender showing my new design;
FIG. 2 is a right front perspective view thereof;
FIG. 3 is a right rear perspective view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevational view thereof, the opposite side elevational view being a mirror image thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a front elevational view thereof; and,
FIG. 8 is a reduced right rear perspective view thereof shown in use condition.
The broken line showings of the irregular central opening, and the attachment apertures, as well as the remainder of the tiller in FIG. 8 are for illustrative purposes only and form no part of the claimed design.