What should I put in that hollow bottom slot? cutting boards? some kind of cover?
What should I put in that hollow bottom slot? cutting boards? some kind of cover?

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Mouse hole cut tidy, ready to stitch.
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Mouse hole patch secured on the outside (temporarily) with painter’s tape so I can sew
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This mess was the ancient bungee cord that ran through the bottom edge of the canvas and secured the canvas ends under the slide-outs. Replaced it with nice new black stretchy cording.