[pa123]

I've been having some problems with the drive shaft on my 123 since I bought it a year ago. It has a very noticable wobble/vibration when it's running, which I think is coming from the flex disc at the hydro pump. I'm hoping somebody can give me some guidance, about what would cause this vibration/drive shaft unbalance when it appears that the flex disc is still firmly attached and not damaged. it's bad enough that it's broken 2 of the fan blades off, and wore through the roll pin where the shaft couples to the flywheel 2 times. And is getting to that flex disc as difficult as it looks? It looks like I'll have to tear apart the whole damn thing to get to it, I'm really hoping there's an easier solution to it though. Thanks in advance for any advice you may have.
- Greg