In article ,
"MRQB" wrote:

Also what holds tension on the rudder cables?

A spring. Those springs sometimes break. If the spring is broken the
pedal will be "loose"...no resistance. When you move the pedals on the
ground the resistance you feel is from the springs.

Control cables are low cost but the labor is going to be rather high.
It's a lot of work replacing control cables.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html