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Whether you need to hold a piece of webbing in place, or just dry-assemble a couple of panels together to get a sense of the look and feel of your creation before stitching every into its final position, you will need small plastic clips. I have more than 100 of these, and I have ran out of clips more than once.
You don’t need anything too big, and clips 2 to 3 cm long are in my opinion the best compromise between strength and ease of use.