Today I had to go through some conduit the sparky installed for running a line. Glow rods didn't even come close, tried a rg6 with the end rounded off but no go. Must have been a really tight bend in the tube.

Ran down to my local electrical supplier and they had a display with Canfor Polyester fish tapes. The display had a 1" conduit with crazy bends and these fish tapes run through them. Tried it out and bought 1 for myself. Best fish tape I have used for getting around tight bends.

[Link: canforproducts.com]

Replacable leader and can be extended with either regular glow rods or an additional identical fish tape.