i saw designed to sell the other night with the know it all blonde monica attempting to install a light fixture.they showed the ceiling box with the light bar and threaded nipple used to mount the light fixture installed.she explains that these here fixture wires have to be threaded thru this small tube (threaded nipple) then connected to the other wires!? they then cut to commercial and the light was done when they came back on. i wonder how she mounted the fixture with the wires going thru that little tube?