Bow and Arrow from the customers garage to get a wire from one end of the house to the other behind a studded wall with no connection to the cement foundation wall. Tied a string to the arrow and fired it down the lenth of the house. Hit the ground and slid the last 4 or 5 feet to the end where a helper was waiting for it to hit something. Anyone got an apple?

Liquid soap to make sure I could get a wire through a run without redrilling.

A cat with twine tied to it.

Homemade electro magnets out of grounding wire twisted around a bolt... thank you 5th grade science class.