I take it that bolt is through the cheeks or action panels? This is a common "repair" that is seen to stop or prevent a splitting head.
Steve is right about pinning and checkering for a way to fix this, or at leat make it better. You would have checkered panels where there shouldn't be. But it is better than a bolt, or a clearly visible pin.
The pin would still be visible through the checkering though.
What I have done to prevent this is, after pinning, actually put in a thin inlay (~1/8") that is the exact shape of the checkering panel that will be made. Then checker it. So the seam of the inlay will fall right where the checkering border is and it is not seen.
