I have a lot of trouble rolling the driver's side door window up and
down on my '65 coupe (3 speed, 200 cu in engine).  Every once in a while
it will roll easily, but most of the time it won't  I've taken the door
apart a couple of times and adjusted the tilt of the vent window
assembly, the tilt of the main glass assembly, and the equalizer arm.
I've also greased the rails and rollers.  (As an aside, is it better to
use white lithium grease, general purpose grease, or something else?).

Despite all this fiddling around I can't get the window to move easily.
 One thing I have not messed with is the window regular assembly
itself.  I've thought of replacing it but I keep thinking that there are
so many other things (like the things above) that play a role here that
I would be surprised if the regular itself is causing the problem.
There is some wobble to the "stem" of the assembly that the handle
attaches to, but I've also noticed some wobble on the stem on the
passenger side and that window generally moves pretty easily.

So, I guess what I'm asking is what are the most likely causes for the
window being hard to roll.  Is it the case that it is a real art to
adjusting all the components just right?

Thanks.

Richard