A/C and Heating question

[spideys85gt]

i'm getting pretty pissed off here, everytime i try to change a dash or i need to take the heater controls out or have to take the temp. cable out, it never works when i put it back in. the cable is really really stiff and wont move anymore. i have no idea why this is. the only thing i can think is i keep bending the wire inside the cable and i doesnt want to move anymore. this has happened to me at least 4 times. does anyone know what the problem may be? like i said, the cable will work fine before i take it off but right when i put it back it doesnt work.