Epoxy should work. Find a piece of material to bridge the gap by about 3/4" on each side of the break, clean with a mild solvent and soapy water, abrade the area with fine sandpaper, when you have everything laid out and ready to glue take a propane torch and quickly flame treat the repair area, not enough to heat the plastic just 2 seconds or so. then glue and clamp the pieces together.