I installed a horizontal conduit under our house. I shoulda included a draw string in it at the time.
Rather than pull it all out and thread a draw string in, I did this:
- Got a length of builder's string
- Tied a stubby steel screwdriver bit to the string
- Fed the bit and some of the string into the conduit
- Used a neodymium magnet from an old hard drive to drag the bit along inside the conduit
Worked a treat!