Noting a correction

Thanks to the questions raised by Jan Brüdigam (@janbruedigam), we found a small mistake in the input-script concerning the double-four-bar mechanism.

The corrected startscript is provided as well as the original one. The small changes affect only the initial velocities of the directors leading to a slightly better approximation of the period length of the vibration (cf. Figs. 12 and 13 in the publication), now matching even better the results from Bayo & Avello (1994) and Roupa et al. (2023.).