harmonic balancer

["evang25" <cullen.swanson@xxxx>]

I have a slight problem with my bottom pulley. The bottom crankshaft 
pulley/harmonic balancer wobbles when the engine is cold. However, 
when I reach down and grab hold of it to see if it is loose, it won't 
budge. It only wobbles when the engine is started and is running at 
low RPM's. When the engine is at a higher idle and warmed up, it 
stops wabbling and evens itself out, so to speak. Is there something 
wrong with my harmonic balancer? Someone told me that there is a 
seal behind the harmonic balancer that probably went bad. Does 
anyone have any advice along this line? The car runs fine with it 
like this - I only drive a mile to work and back every day. I would 
love some input from all of you before I take off the pulley and 
start looking for things. 
Thanks 
Cullen 
Clovis, NM
'76 258 manual