Holder for pencil

For the displacement-time recording of a harmonic oscillation;
Tube for holding a pen, with slot for attachment to the flat spring and hole for holding slotted weights SE with the threaded rod with butterfly nut
Dimensions: 43 x 44 x 15 mm
Mass: approx. 13 g

additionally required:
1 x P1810-1D Flat spring, 300 x 25 x 0.6 mm
1 x P1810-1G Threaded rod with butterfly nut
Slotted weights SE