The tool sold at Aircraft Spruce in action. In this picture the cotter pin that holds the axle nut has been removed and the tool has been inserted through the end of the axle nut into the axle.
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The white arrow points to a hole drilled and tapped 10-32 in the axle nut. A matching drilled and tapped hole on the opposite flat of the axle nut.
Strategic stacking of some scrap wood underneath the bottle jack scientifically calculated to accommodate the ram length of my jack. Picture required so that one year later I don't need to recalculate.
As stated before, remove cotter pin, jack it up, unscrew axle nut and slide it onto the steel tube, slide wheel off axle and onto steel tube, put some wood blocks under the axle, lower onto wood, remove tool and wheel.
Axle nut mod shown below.
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Drill hole in end of axle nut to allow insertion of steel tube of tool.
Fabricate steel strap bracket. I think I used 0.063 steel strap. Spruce sells 1" wide strips cut to manageable lengths. Bracket has nut plate on top end to accept bolt/screw for wheel pant. Sides of strap drilled for 10-32 screws used to hold strap onto axle nut. Obviously the 10-32 screws can't be very long, fiddle with washers to adjust depth of screw so that they grip the bracket before bottoming out on the axle.
Hope that helps.