When fishing a wall or ceiling cavity sometimes a piece or two of 1/2 PVC conduit has enough flex to be bent and shoved in the opening yet is rigid enough to move straight up or down a wall cavity or across a ceiling without getting bunged up like a fish tape does, and can push past insulation ( If you really must go through an insulated cavity) and debris if some exists... Used it in a 1 floor balloon frame house many times, fished from the basement to the attic and never had to cut a single hole [Linked Image]

A.D