This "trigger job" won't
address the weight or length of the trigger pull, but will make
it much smoother than the gritty pull that plagues
many SKS's.
The first step to improving a trigger
is to clean off the years of crud on it. Soak all trigger parts in
cleaner for several hours and scrub them down with a tooth brush.
After cleaning, polish all the
contact surfaces with 320 to 600 grit
sandpaper. The object is to just smooth the parts,
not remove much material. All the sanding was done in
the direction the parts move.
In the photos below the "must
do" areas are shown in red and should get most
of your attention. Blue indicates the areas you may
as well smooth up while you have everything apart.