First, I cut off the tab on the top of tube. Then drilled a tiny hole...just large enough to feed fishing line through...in tube top and bottom. Next, tie off end of line at tube bottom. Using double-sided tape and exacto blade, add your prop onto fishing line inside tube. As you are closing tube, feed other end of line through tube top and pull taught. Add a dab of super glue to hold line, and clip excess line. On a scroll saw, cut 2 inch round wood disk into approx. 1/8 inch ring. Turn tube upside down and insert into ring.