The ornamental design for an expander for fasteningtrack for fabric wall coverings, as shown and described.
FIG. 1 is a perspective view of an expander for fastening track for fabric wall coverings, showing my new design.
FIG. 2 is a first side view thereof.
FIG. 3 is a second side view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The expander for fastening track for fabric wall coverings is shown with a symbolic break in its length. The appearance of any portion of the expander for fastening track for fabric wall coverings between the break lines forms no part of the claimed design.