The invention relates to an assembly (1) of a motor (2) for a tube (101) of a screen and a set of plugs for engaging an inner surface of the tube. The set of plugs comprises a drive plug (10) for driving the tube, which drive plug is arranged to be connected to a drive shaft (3) of the motor. The set of plugs comprises a crown plug (30), which crown plug is arranged to be connected to an outer end of the motor for forming a first bearing at one end of the tube. The set of plugs comprises an end plug (20) arranged to be inserted into the tube at an opposite outer end of the tube for forming a second bearing, wherein each plug is provided with adapter means for adapting the outer diameter of the plug to the inner diameter of the tube.