Step 9Insert Bones and Bind Bottom Edge
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Measure your bone casing and insert the appropriately sized bones Figure 9-1. Make
sure to leave at least 1/2 inch of space at the bottom to bind the bottom edge.
As mentioned in step two, make sure the you use spiral steel bones for the four side
bone casings and spring steel for the back bone casing (5 total per side).
The inner channel near the back edge is for grommets. Do not insert a bone here.
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Bind the lower edge exactly as you did the top edges. Figure 9-2
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