It happens that Harry Bloomfield formulated :
My bathroom extract fan's wax actuator has failed. This is used to slowly
open the shutters, when the fan is triggered. This one..

https://www.ebay.co.uk/itm/223481092415?ul_noapp=true

It looks as if it has over-heated in the area, before it actually failed. As
it is marked 120/240v I'm thinking to install a dropper to reduce the voltage
across it to around 120v, but I cannot find a specification for the wattage
or current to determine a suitable dropper.

Anyone know please?

I've just had another idea - a 400v diode will reduce the consumption
to around 50%, without the extra heat dissipation of a resistor.

Just trying to extend the working life of the actuator.