Now for the hard part, putting the ranks with the pallets and pouch boards all together, to make speaking stops.

    While doing the preliminary tests of the leak tightness of the pouches (see Chapter 21.3), I discovered all sorts of leaks between the pouch boards and the vertical channel panels.  Close examination of the vertical panels disclosed that they were slightly warped.  The array of cardboard washers that are supposed to concentrate the gasket force were not perfectly level, and some of the seals were imperfect.

    I had to level the array of washers, by building some of them up with additional cardboard punchings.  Piano fron rail punchings, 7/8" diameter with the centers punched out to match the holes, were glued on as required.

    The Chapters in this section are:
        Chapter 21.1 - Introduction
        Chapter 21.2 - Gluing the pouches
        Chapter 21.3 - Testing the pouches
        Chapter 21.4 - Chest assembly
        Chapter 21.5 - The pallet tiewires
        Chapter 21.6 - Functional test

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