The ornamental design for a bowlingballfingerinsert, as shown and described.
FIG. 1 is a right front perspective of a bowling ball finger insert, showing my new design;
FIG. 2 is a top plan view, thereof;
FIG. 3 is a bottom plan view, thereof;
FIG. 4 is a front elevational view, thereof;
FIG. 5 is a side elevational view, the opposite side elevational view being a mirror image, thereof;
FIG. 6 is a rear elevational view, thereof; and,
FIG. 7 is a perspective view, thereof, in the environmental of its use being installed into a bore in a bowling ball, the broken line representations of a portion of a bowling ball and a second installed insert being included solely for illustrative purposes, forming no part of the claimed design.