I made this adapter so that either a 1 in. adjustable wrench or a 3/8 in. ratchet could be used to help remove stubborn wing nuts for Thule products.

Do not use this for tightening, as these are designed to be hand tightened. If you put too much force on the wing nut, you will cause the plastic to shear from the nut. If that happens, the plastic must be removed to fully remove the internal nut.

I printed on an Ender 3 S1 Pro using PLA+ and settings of 4 wall loops, 25% infill, and 0.2mm layer height. I would recommend printing the 1 in. hex side down with support material.