Put a threaded end through the hole in the
upright.
Slide the top side rail onto the threaded end
and push its wooden dowels into the holes of
the upright.
Turn the threaded end into the barrel nut, while
positioning the barrel nut, if necessary, using a
coin or a screwdriver.
The lower side rails should be mounted the
same way, their nylon bearings facing the
middle of the loom.
After you mounted all four side rails to the
castle section, position the front posts onto the
dowels of the side rails.