The Brompton CatEye Volt light was introduced in 2016 as a 300 Lumen light - the Volt 300 and upgraded to a 400 Lumen light in 2018
The problem is they have been in short supply (none so far this year?)
And CatEye have discontinued the Volt in favour of a new light - the Ampp
But what if you want one on your Brompton - you can't get a bracket
Here's an idea on how to mount a CatEye AMPP light
We previously made a video on how to install the Brompton CatEye Volt 400
https://youtu.be/J62uVJUo_HE
And how to install the Brompton Hub Dynamo (for how to fix / replace the bracket from that)
https://youtu.be/9sLr2xIvY0U
Let us know if you have already tried this?