Using the back plate from LeecarL's design I've made another version.
Here you only mount the Sensor and magnet in the handbrake and I would advice using a coil cable to connect to the Arduino
1 KY-003 - 49E (make sure you have a analog and not a switch)
1 10mm x 4mm magnet
The author marked this model as their own original creation. Imported from Thingiverse.