A method for monitoring a chain pulley block and a chain pulley block apparatus with an electric actuator motor that is connected at the drive side to a transmission across a sliding clutch. The method further includes detecting first heart beat occurrences on the first signal, each first heart beat occurrence having a respective time associated therewith and detecting second heart beat occurrences on the second signal, each second heart beat occurrence having a respective time associated therewith. The base is fitted to the handlebar whereby a sidewall of the first section touches the handlebar. The N value is adjusted in one direction until the tuning voltage reaches one of the tuning voltage limits.