This C-Storz coupling is intended for mounting on a ceiling. The lamp consists of old fire hose.

The holes are designed for M4 flathead screws.

V2 is the corrected version with the holes at the right place, and more space to attach to hose with seal.
added TPU-seal for mounting with seal.

For attaching to the wall/roof, V2 would do its job.

lampsocket_G10_V1 is ment to hold an G10-lamp, i only printed it once and didnt like the look, so i decided to mount the lamp directly in the hose.