How about a picture -- from your description it sound like the crack is near the toe, but I'm not sure. Did it crack near the buttplate screw? If you have a toeplate, maybe you can take it off and close up the crack with a screw (and some glue, epoxy, etc.) countersunk under the toeplate or something like that. A hairline crack won't be that bad, although it'll always look worse to you than anyone else.