in a vertical plane transverse to the connector body common with a vertical lower abutment edge 49 of the connector profile the cross runner connector receiving hole 13 is stamped in the web 15 of the through or main runner 12 the hole 13 has a shape similar to the capital letter a being symmetrical about a vertical axis a narrow top 51 of the hole 13 has a width adequate to receive the thickness of two connectors 10 with moderate clearance a notch or shallow slot 52 at the bottom of the hole 13 between a pair of abutments 53 is similarly proportioned to receive a double thickness of a connector body with moderate clearance the distance between the top 51 of the hole 13 and the top of the abutments 53 is greater than the distance between the bottom of a connector notch 46 and a lower edge 54 of a forward end of the connector 10 opposite sides or edges 56 of the hole 13 are arcuate and convex a cross runner or tee 11 is assembled to a main runner or tee 12 by inserting its end connector 10 in an appropriate hole 13 the body of the connector 10 is inserted in the center of the hole 13 so that its lower edge 54 is in the central notch 52 the cross runner 11 is pushed towards the main runner 12 until the connector profile edges 48 and 49 abut the surface of the web 15 surrounding the hole 13 this insertion motion causes the tab 41 to be forced towards the main body of the connector 10 by a camming action developed by interference between the tab and a side 56 of the hole 13 before the connector edges 48 and 49 contact the.