If the "crack" is on the thread coating you could cover it with nail polish or mix a tiny spot of epoxy. If the crack is on the rod the look at it under magnification. Chances are that it's just on the surface.
If the "crack" is on the thread coating you could cover it with nail polish or mix a tiny spot of epoxy. If the crack is on the rod the look at it under magnification. Chances are that it's just on the surface.