I'm getting ready to run a rear brake cable through the top tube. It's an inexpensive SS, and I intend to simply drill two holes in the side of the TT front and rear...but then comes the part about trying to locate and fish out the end of the cable once I have it threaded though the front hole. Maybe a piece of wire first? Please advise. (This is my first post on Bike Forums, so treat me gently.)