Strangely enough, I do not see window glass adjustment in the miata.net
garage section.  In any case, the enthusiast manual has a description.
You may also want to look at the miata.net garage sections on slow
power windows.

Leon

do you mean the vertical rubber guide at the front edge of the window?  the
thing that is adjacent to the back of the non moving vent window?  if so
then i suggest you simply roll down the window and sparingly apply some
spray silicon to the channel of this guide with the straw nozzle that
aerosol silicon cans come with.  i say sparingly because if it gets on the
window it is messy and hard to remove (lots of wasted cloth or paper
towels).  i spray mine periodically and find it more effective in reducing
resistance for rolling the windows up/down than the more complicated method
of applying lithium greases to the window tracks that are behind the door
panel.