They used washers to keep the nails from slipping through - key to realizing it needed something much more substantial to hold it was the 3/8's + hole in the mineralac. The must have been a PITA to hammer..... I would have opted for 90 degree 3/8 rod hangers, to strut and may have doubled up supports for each 10' - Easier to hang on top of the strut that way.
Mark Heller "Well - I oughta....." -Jackie Gleason
