Abstract: An improved device for securing a structural member to a generally U-shaped longitudinally extending channel member is set forth. A bridge section connects together two generally parallel sidewall sections with the sidewall sections each having a respective lip which extends inwardly laterally towards the other sidewall section and bends towards and ends a spaced distance from the bridge section. A first nut has oppositely extending lateral arms which are adapted for positioning beneath and are engageable with the lips. A bolt can be threaded into a threaded opening in the nut. The improvement is a support member positionable between the bridge section and the lips and between the sidewall sections. The support member has a pair of lateral sides, each positionable adjacent and facing a respective one of the sidewall sections. It also has a pair of ends alignable along the channel member. The support member defines a cavity generally orthogonal to the lateral sides and to the ends.