As part of my off farm day job, I spent some time with an electrician today repairing a servo positioner. It got me to thinking of a project. Its easy from a mechanical perspective to rig up an electric actuator such as this https://www.ebay.co.uk/itm/12VDC-El...hash=item41e694d833:m:mQG4X6Jdkgw-8qlnDuxkzRg to operate the manual actuation handle on the fertilizer spreader. More research would be needed to shoose an actuator the travel speedis too slow on that model. The good news is my ebay link even has a controller with it to allow me connect limit switches. (A limit switch is a switch mouted on the mechanism such that when it is made it will cut off the supply to the electric motor in the actuator and it will stop extending.) I ts easy using the comtroller to connect a limit switch. Its easy install the limit switch such that it is made when the actuator would start pushing against the maximum opening set via the manual control stopper. Thus Im looking for a v precise limit switch, a limit switch with a range of +/-1mm isn't much use, otherwise fert spreader won't open the same amount every time. any ideas?