Did just the fiber optic break?
When my fiber optic broke on my 12 ga, local archery shop had the right diameter optic material. I pulled out the broken fiber, cut a piece slightly larger than the blade, slid new piece in, and used a hot knife to slightly melt/expand the ends. Worked fine till it gotbumped again. I gave up and put a red dot on it. thinking of putting one (red dot) on my new Omega.