Gluing kerfing to the top edgeWhen the neck and tail blocks are dry, the kerfing (also called lining) is glued in. The kerfing I use is a triangular strip of mahogany (on the back) or spruce (on the top) with notches (kerfs) every 1/4-inch or so. The kerfing provides extra surface area for gluing the top and back to the sides. The notches make it flexible enough to bend without heat.
As any luthier will tell you, you can never have too many clamps. This is never more true than when gluing the kerfing. I like these little rubber-tipped Pony spring clamps and it takes about 50 of them to line the top or back of a guitar.