A bunch of years ago when I built the vertical stab on my -8, I ran a string through it with a little slack in it and a washer at the end of the string at the top, just in case I wanted to do something up top later. Mine is a super slow build and the project is still not finished, but I am anticipating only adding the tail light/strobe at the bottom of the rudder. The string I can cut later before adding the tips..