Cateye HL-EL510/520 Bike Light Bracket
Useful spare bracket for these bike lights. Strap it to your handlebars with a couple of thin cable tyes and put a piece of rubber(e.g. from an innertube) between the bracket and the handle bars to stop it slipping.
You may need to file it a bit to make it easier to push the light on.
I made v2 stronger than the original as I managed to break the original version.
onshape link https://cad.onshape.com/documents/628f43979681522ce2157a1c/w/7d8e1469a5acd446a57b28a0/e/8d70108fc21a648c182d211a