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Try eBay... or Google... search for line optics..
Jerry
Try it and see. Look for a glass cylindrical rod with a diameter close to, or smaller than, the beam diameter. Sometimes people use them for stirring drinks, you might look at a home supply or ktichen supply store.
I don't see why it wouldn't work, but you might not get a full 180, and you might have a brigher spot in the middle.