No sewing here. The first step is made up of three 18" soft loop tie down straps girth hitched into one another. Similar to these:
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Then I took the ends, pushed them through the holes in the bottom steps and girth hitched them to the step. It is hard to see in the photo of the Hawk because I added camo vet tape over the step afterwards...
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Easier to see here on my mini API
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Then the second step is just a length of tubular webbing tied into the lower loop of soft loops 1 & 3.
Disclaimer: This works for me and I have never had a problem. That said, test at ground level extensively if you want to try it...