Threaded rod with butterly nut

For displacement-time recording of a harmonic oscillation and determining the oscillation period of the flat spring;
For attaching slotted weights SE to the flat spring Steel
M3 thread with two wing nuts
Dimensions L=60 mm
Mass: approx. 6 g

additionally required:
1 x flat spring, 300 x 25 x 0.6 mm
Slotted weights SE