Peugeot Centennial Edition (PH12) Resto. Getting Aero cables through the down tube.
 

I'm helping restore my buddy's '82 Peugeot Centennial Edition (PH12) back to stock/period appropriate.

I'm at the point where cables need to make there way back on, however, while cleaning, I didn't secure the plastic guide sleeves on the down tube and one of them fell out. Luckily, the other didn't (I secured it with black tape, partially seen in one of the shots) so I only have to thread one sleeve back through. However, even with only having to thread one sleeve, this doesn't seem like it is going to be an easy task.

Does anyone have any advice or thoughts on how this can be done as painless as possible?
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Give the cable a tick of curve and visualize where its going to run from the outside. Insert and then guide with a magnet. It will be frustrating.

Maybe you can use some solid core, copper, thin gauge telephone wire that will be stiff enough to bend to a small "L" at the end but still be thin and flexible enough to feed through the first hole easily, down towards the other opening. You might have to jiggle it around to get it to eventually pop out of the second hole. You might also consider using thick nylon fishing line, but that tends to coil around too much inside the frame tube.
I remember using fishing line to pull my Avocet 20 computer sensor wires through the brazing vent holes on the top and bottom of my PSV's right fork leg to hide the messy wiring up front. It took a bit of time to do but nylon fishing line worked for me for that instance, mostly because the fork leg tube funnels down to such a small section at the end of the fork leg that the nylon line did not have any other palces to go but at or very near the vent hole. The wires are still in the fork leg and the Avocet 20 contnues to work to this day!
Good luck with the cable routing!

Chombi

Best method. Tape all holes up in the frame except the guides. Take a piece of string and insert one side in. Blow compressed air in the guide the string is in and the other end should miraculously fly out the other side. Tie it to a cable and pull it through. Then thread the housing.

Thanks everyone.

I think the most realistic and logical sounds like the solid core, thin wire option. Although, guiding the cable through the tube with a magnet also sounds like a clever way to make it work as well.

Keep the options coming!

I'm telling you, this method works like a charm.

Don't know if you have an air compressor though.

I actually just picked up an air compressor, Puget Pounder. I suppose it wouldn't hurt to try.

Has this worked for you in the past? I only ask because I see your original post says, "the other end should miraculously fly out the other side."

That could work with "canned" compressed air.
I concur, give this one a try first before the wires! Never thought of this one, but it does make a lot of sense.

Chombi