FIG. 1 is a bottom perspective view of a cord tensioner showing the claimed design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top perspective view thereof.
The dash-dash broken lines illustrate environmental structure and form no part of the claimed design.
Conventional contour lines and/or surface shading are illustrated for purposes of highlighting the solid-rendering, but form no part of the claimed design.