The present disclosure refers to an assembly for a dosing system of a spreadermachine fordistributing a granular material or the like, comprising: a first memberprovided with a first opening,a second member provided with a second opening, and an actuator connected toat leastone of the first and second members and configured to provide a driving forcefor relativemovement between the first and second members, thereby, adjusting an openingsize of a dosingopening provided by an overlapping area in which the first and second openingsare overlapping.The relative movement is conductable by linear movement of at least one of thefirstand second members.
