in a hole 13 and properly located longitudinally the associated tab 21 is manually bent back into its original plane the hole 13 as mentioned is slightly smaller than the bulb 22 so that the grid runner 11 is frictionally locked in position as shown in fig8 the ceiling 12 can include wall channels 56 for supporting ends of grid runners 11 an upper flange 57 of a wall channel 56 can be locally cut on both sides of a support bar location for clearance with the end of the support bar the severed part of the flange 57 can be bent upwardly to a vertical position the clip 49 can be assembled behind the channel and fastened to a wall with a suitable screw the disclosed features of the support bar facilitate assembly of multiple support bars where the span of the ceiling area is greater than the length of a single support bar referring to fig5 it will be understood due to the slug cutoff discussed above the end of a support bar will not interfere with the last hole 13 or a grid runner in such hole where the ends of two support bars are lapped and the center to center distance between hole 13 is maintained the ribs 30 make the lapped support bar ends self centering in the vertical direction and guide the ends horizontally until a set of holes 26 are roughly aligned a self tapping screw driven in any pair of the roughly aligned holes will precisely register the support bars together with the desired center to center distances of.