I have repaired one of these with super glue. It was tedious to get the broken edges perfectly aligned and straight. The trick is to practice several times to get a feel for how to put them together with proper alignment. Small drop of glue, orient and place, and hope it sets while everything is straight. Mine did, and light continued to transfer the length of the plastic. I can’t say it will work every time, but it worked first time for me, and that unit is still going. First choice would be to buy a replacement. But if none available, give it a try.