I centered the hole @ 1 1/4" off the window frame. The right side of the square alum-frame tube is at approx 1 7/8" off the window frame; so, you could go about 1 1/2" off the window. I sat my wife in the seat before I chose the elevation for the anchor. This is approx 25" - 26" above the top of the seat cushion. Got another bloody hole to fill now...
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