I am trying to create a smart component, containing (2) nuts, (2) flat washers and a roller. I am building a roller conveyer. I want to coincident the roller assembly onto the legs of a (2) channels, there are (69) rollers required.

    I tried to make smart the shaft diameter and a hole in the channel leg a concentric mate and one of the faces on the washer to be coincident to the channel leg.

Does anyone have a suggestion? I have attached the components.