Originally Posted by Azarr
I lock the surface in place using these simple jigs, that way they're always centered when you heat shrink the last piece. The strange material is something called balsa that we used in another life.
I've actually found the surfaces to sag slightly when I use a jig. I don't use one any more, there's normally enough friction in the heat shrink that keeps the rod from moving, so I get it centered, with no sag.