Quoting from the manual : No maintenance required except a periodic check for tightness of mounting and condition of lead wire. The mercury switch should make contact and complete the circuit from from starter switch and motor if the terminal endis below the horizontal position. When the roundedend of the switch is below the horizontal position the switch should break contact, preventing operation of the electric starter. The switch should make or break contact when the angle between the bracket and the horizontal line is more than 52 degrees and less than 64 degrees. My note : the last line is unclear to me since I have no clue what ‘bracket’ it’s talking about, and the illustration doesn’t help me. Anyway, it appears there may be a provision for moving the switch to change the angle of the dangle ?

I bent the mounting tab on mine slightly to allow a little more throttle.