I need to know how you guys handle a situation like this: I've got a large installation with about 250 security drops (RG-59 Siamese) running a cable tray. Tray runs straight back to front with a 90-degree left-hand turn, about 25' over a finished ceiling with ducts and sprinklers above, then a 90-degree right-hand turn, another 20' over a similar finished ceiling, then waterfall down to the rack. Tray is in the steel, 23' AFF, ceiling is finished at about 8.5'. GC won't allow ceiling grid to be removed, nor will he allow scissor lifts in finished offices. So unless I can get somebody on an extension ladder at the hidden corner to "babysit" (this cable has a habit of jumping the corners of the tray in a good situation), how do I handle getting the cable in the tray? I'm afraid that if I try to pull through the corners (even taking a new zip line through with each 15 or so cables) it will turn into an ugly, unmanageable mess! Suggestions (please!!!!)?