Mountain bike bicycle spiral lock mounting bracket

I made this mounting bracket to mount a decathlon spiral lock to my mountain bike.

See image for the lock which was used.

Probably can be used for other spiral type locks as well, the hole diameters in the design are 13.7mm (main hole) and 11.8mm (smaller 'upward' hole)

I've made two versions for different bike fitting options:

• 36mm tube version: for mounting on the top part of the seat tube (which has a diameter of 35.5mm in my case)
• 27mm tube version: for mounting on a standard seat tube of 27.2 mm diameter

I've put i small piece of inner tube between the clamp and the frame to prevent slipping, but i don't think that's absolutely necessary.

What you do need is two M5 screws of approx. 20..25mm and 15..20mm

and two M5 treaded inserts as can be found on ebay (see image)

I printed the parts in ABS at 0.2mm layers, 4 perimeters, 25% infill