Second, wedged sliding dovetails always self-align, so any combination of sections acts as one, preventing "joint sag". Finally, by making the tool in sections, you can use the MS-96 Precision Measuring Stick on all measuring tasks from 21" up to 97" without encountering knob interference.
Four brass locking knobs are infilled with rosewood, matching our other tools, the fifth is solid brass for purposes of engraving. The nylon tipped locking studs prevent scoring of the sections and mate with threaded brass bushings-a nice feature for you and your heirs. Finally, the nickle-plated tips (contact points are a scant 0.030" wide) are easily replaceable when your tool takes an inevitable dive to the floor.