How have you bodged the light on the back of the Surly? Just a bit of a tube to push the light out? I just clip mine and and let it bounce about as an attention grabber and fit another static light further doen the seat stay.
Yeah it's just a bit of tube I had. Means when I lock it up on my commute the light comes away with the bag so there's one less thing to remove/forget to remove!
On my Nelson I have a couple of clip on lights with a spacer between them so they don't rattle and mount one on the seat stay also.
How have you bodged the light on the back of the Surly? Just a bit of a tube to push the light out? I just clip mine and and let it bounce about as an attention grabber and fit another static light further doen the seat stay.