The ornamental design for a coversupport for eavestrough, as shown and described.
FIG. 1 is a perspective view of a cover support for eavestrough;
FIG. 2 is a side elevational view thereof as seen from the right hand side of FIG. 1;
FIG. 3 is an end elevational view thereof;
FIG. 4 is a side elevational view as seen from the left hand side of FIG. 1;
FIG. 5 is a partial bottom plan view therof; and,
FIG. 6 is a partial top plan view thereof.
The broken lines shown in the figures are for the purpose of illustrating environment only and form no part of the claimed design.
The cover support for eavestrough is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.