Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4700450.

Lamp holder for the middle of the handlebars around the stem

I have a simple LED lamp on my handlebars of the Mtb but because my handlebars run from thick to thin from the stem stem to the handles, it does not stay in place and turns constantly

You use the existing holder of the lamp and I mounted it here. You also need 4 screws M3x25. I tapped M3 thread in the holes in the holder

handlebars Ø 32 mm Stem ◙ 40 mm