A modified clamp to fit a Cycleafer, and probably a Berlin Standard, bicycle lamp to the larger 35mm handlebars.
I've included the original Fusion 360 files, a version exported to STEP and the STL files. In separate zip files, so just download whichever is most appropriate for your needs.
For more information see my blog:
https://blog.discoverthat.co.uk/2019/02/cycle-lamp-bracket.html
==