Elecraft K3 Assembly Manual - Manual (Page 59)

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Attach the shield to the RF board and to the rear panel as shown in Figure 81. The screws, washers and nut
are in the KPA3 Option kit. The standoffs are part of the K3 kit hardware.
Figure 81. Attaching the KPA3 Shield.
Remove the stiffener bar from the top cover and install it on the chassis as shown in Figure 82. The
hardware required to attach it to the shield are in the KPA3 Option kit. The black flat head screws used to attach
it to the side panels are part of the K3 kit hardware.
Figure 82. Installing the Chassis Stiffener Bar.