Elecraft KPA500 Kit Assembly Manual - Manual (Page 11)

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 Oriented so the widest shoulder is always toward the side of the bottom cover. (Whenever you install a
2D fastener, the widest shoulder goes toward the outside so the fastener will be flush with the edge.)
Don’t be too concerned with getting the 2D fasteners precisely straight. You’ll adjust them later.
Figure 6. Installing 2D Fasteners in the Bottom Cover.
Remove any tape or tape residue you may find on the inside (partially painted) surface or on the outer
surfaces of the raised sides covering the unpainted area as shown in Figure 6).