Do you feel lucky?

If so, just leave it as it is and fly the plane. Fix if things deteriorate.

Do you feel unlucky?

Take the least painful route - remove covering next to fin and whatever surface buts next to it - either top of fuse or stab - epoxy a triangle balsa fillet on each side, maybe 1/2" triangle or so. Put on some covering and fly the plane with no more worries. Forget about it forever more.