Tie a continuous loop. Tie in steps. Add rigidity to the steps with tubing or whatever you fancy, or don't. It's simple as pie, it just take sitting down with a few beers to adjust everything right where you want it. Start with about 2x as much rope/webbing as you think you need, the knots suck up a lot of rope. Center everything so that your knot jams into the stick bracket, this adds nice stability.
If using accessory cord, double fisherman's knot for the loop and figure 8 follow through for the steps.
If using webbing, all water knots.
This one is 7mm accessory cord. I also made one of out webbing. I don't have a strong preference between the two.
Three steps is very aggressive for an aider. I like two. I pretty much always use both steps on my bottom stick. Higher than that I usually just use one step. It's a lot easier to kick out with two steps than one.
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