My wife needed an adapter to finish off a cool yard light. It didn't take long to find this one on Thingiverse. I used Rhino3d to Boolean out a larger hole than the original size to fit the solar light base.

We used an old brass chandelier we found in a rummage store for cheap and added the lights from Lowe's. The new light fixture is hanging in our garden arbor.

Thanks for the thread design Toybuilder!

Instructions

Insert light into adapter.

Screw in adapter.

Easy enough!

Printed at 30% with two shells. Don't forget there is a hole underneath, so use support if you are printing this on a filament printer.