Internal cables/hoses are extremely easy to install on the Travers RUSSTi. Simply before installing the forks in the frames headtube guide the gear cable/brake hose in to the rear internal hose/cable entrance (nearest the seat tube). If it doesn't pop out into the headtube you might need to help guide it with your finger to the exit. That's it, no fishing around with a piece of wire/magnet/vacuum inside the tube!
Depending on the cable/hose you use it might rattle around inside the tube when going over rocky sections. There is a very simple solution.
You will need cable frame protector. Here is am using a Fibrax spiral frame protector because they are easy to wrap around the cable in a tight confined space.
You only need 1 protector per cable/hose, cutting it in half makes it easier to put on the cable/hose.
Install the cable/hose, cut it to length but do not attach the brake or run the cable through the rear mech.
Pull the cable forward about 30cm, install the cable protector over the cable/hose, then slide the cable hose back inside the frame. I found 1 was enough to stop any noise but you can add a cable protector every 10 cm, just by sliding the cable in smaller steps and adding another cable protector.
Do the same on the other cable/hose.
HAND BUILT TITANIUM FRAMES.