RE: Reaction 54 Jet Kit
For what it is worth... I've never lubricated the elevator and rudder cables. They slide free enough and I never get a buzz from the digital servos at center. I would worry about the plastic sleeve swelling and causing a bind IF lubricated. Secondly, the lube might just thicken over time and cause the very thing you wanted to "cure". I won't mention the mess graphite would make... I say leave 'em dry and don't fix something that ain't broke.
Dave Rigotti