For the beautiful „Géode Lamp“ (https://www.youmagine.com/designs/geode-lamp - therefor a thanks to Matthieu Dupont de Dinechin), I designed an adapter, to install a LED-light with a socket G9. The adapter for the socket G9 has a centering diameter of 10 mm. You have to drill out the two printed holes with a diameter of 2,45 mm. Afterwards to tap the threading, use a thread cutter M3. Depending on the selected print size of the „Géode Lamp“, the centering hole have to drill out/mill to the 10 mm. The socket G9 will be screw together with the adapter for an easy mounting. Afterwards will this glued into the lamp.