So, if it's not one thing it's another.  I replaced the left side belt pulley and spindle assembly.  Thought every thing was great, and... It's not.  Still a lot of vibration, the left assembly and pulley gets hot and seems to not be as free as the right.  I'm a tad irritated.  I'm going to grease the hell out of it, try a new belt, and maybe light the thing on fire and see if that cures the issue. Any ideas this time around?