Shutter for cable release to terraPin Kailu 6x18

Wen i was in the mountain and only had a gorilla pod trying short exp. times the camera was shaking. Therefore, I would like to use a mechanical cable release.
This was the basic for the design.
Using a small rubber band an M3 bolts. Drilled hole in the camera and threaded M3
It was printed in ABS and PLA. 0.2 resolution and solid for the shutter and the rest 20% infill
The cable release is an cheep eBay thing
Using some lube between the shutter parts
***** Not tested with film yet *****