We claim the ornamental design for a magnetic stripe reader card stabilizer, as shown and described.
FIG. 1 is a top, front, left perspective view of the claimed design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left elevation view thereof;
FIG. 5 is a right elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings form no part of the claimed design. Included herewith is an appendix including drawings according to the present invention using drafting techniques to comply with foreign practice and to provide support for foreign filing.