Fully Printable Pull Force Gauge

I didn't like my adhesion test rig (https://www.thingiverse.com/thing:5269109) requiring someone to purchase a trigger-pull force gauge, so I made a fully printable one. Everything - including the spring - can be printed. The quasi-sinusoidal spring is designed to hit maximum compression before flexing beyond the elastic limit of PLA. ABS or PETG would obviously be better materials for a spring, but this spring is actually designed to work with PLA..