Has any tried to use Tritium Vials to light the side markers? These are the replacement vials for low light gun sights. It seems a lot less invasive to put a insert in than route out the back of the finger board, or try to lay fiber or wire next to the truss rod. Tritium has a half life of 12.5 years. I have a custom 4 string about done I can't find a vendor to purchase the vials from yet. Any help from out there in bass land.