I still haven't had the time to play with this, but I love the idea. Have been thinking about it a lot: What about using the driver as the support? I'm thinking upside down (assuming a "T handle") for support, & the webbing or rope through the notch in the driver, or even have an add on "Y" attachment. To use any of these "ground stakes" you need some sort of driver, why not have it do double duty.
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