Wobbly Speedometer...Speedo head worn?

[ps2cho]

This is my next job on the wagon.

Problem: Speedometer needle is erratic and has a 20mph swing when I am going between 50-80mph. I can hear it spinning behind the cluster -- click, click, click, but at a high speed.
I have replaced the cable, TWICE (Gemo brand). It is routed correctly against the transmission.

Could the actual speedometer head be worn a little so that it is slipping inside?
Any other things I can try here?

PS: This has been going on for 7 years...I kinda just got used to it, but now its affecting my cruise control since I sent it off to be resoldered + fixed last month. The cruise control will stutter because the speedometer is swaying. Plus its just driving me crazy now and I've had enough.