I no longer have an 8x10, but when I had one I used to protect the groundglass with a home-made slip-on cover made of 4mm thick foamcor which you can buy from an art supply store for about $4 per sheet (poster size). I cut two panels that fit the front and the back of the groundglass, then hot-glued a strip of cloth to serve as the hinge. Foamcor is stiff enough to insert in and out of the groundglass, and the paper surface prevents scuffing of the camera. The expanded polystyrene sandwich also absorbs shock better than a solid surface. Worked real well for me. Easy to make and inexpensive too. I spray painted the outside surface of one panels flat black, and ocassionally used the panel as a flag to prevent lens flare.
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