I wanted to mount a rear reflex and a rear light on my back mudguard.

I designed a adapter to mount on the back mudguard.

You can mount it horizontally or vertically. I mounted it horizontally.

Instructions for mounting the adapter:

1. You need to print the part

2. Mount 2x M5 nuts in the adapter

3. Take down the rear wheel

4. Drill 2x 5.5mm holes in the mudguard

5. Use 2x M5x15 screws and M5 washer

6. Mount the adapter on the mudguard

7. Install the rear wheel

8. Assemble the reflex and rear light on the adapter