The ornamental design for the attachment point for an outriggerguide, as shown and described.
FIG. 1 is a first perspective view of an attachment point for an outrigger guide;
FIG. 2 is a second perspective view of the attachment point for an outrigger guide;
FIG. 3 is a third perspective view of the attachment point for an outrigger guide;
FIG. 4 is a fourth perspective view of the attachment point for an outrigger guide;
FIG. 5 is a first elevation view of the attachment point for an outrigger guide;
FIG. 6 is second elevation view of the attachment point for an outrigger guide;
FIG. 7 is a first side view of the attachment point for an outrigger guide;
FIG. 8 is a second side view of the attachment point for an outrigger guide;
FIG. 9 is a third side view of the attachment point for an outrigger guide; and,
FIG. 10 is a fourth side view of the attachment point for an outrigger guide.
The broken lines immediately adjacent to the shaded areas represent bounds of the claimed design while all other broken lines in the drawings illustrate portions of the attachment point for an outrigger guide; all broken lines form no part of the claimed design.