This are the files for my brake test apparatus.
I use a skateboard bearing screwed to the base board to rotate the puller arm around, and I use a wire from the puller to the arm.
video on showing the device in use:
Meter used
https://www.amazon.com/HF-500-Digital-Gauge-Force-HF-500N/dp/B00EE2FCDA
The author marked this model as their own original creation.