First melt some wax in a fry pan.
Take your top bar and make a slit on each end at the center on the comb side.
Take a peice of thread and horizontally dip it in the wax several times or until you have the desired thickness. In this case the same as a mid rib.
Lay the thread along the bar and pull the ends of the thread into the slits you made. I secured the comb guide to the bar with a heat gun just to insure adherence.
Once the wax was melted one bar took under 5 min.
NO mess, NO waste Easy clean up!!!!!!