Elecraft KPA3 Manual - Manual (Page 19)

19
Replacing the Covers
REPLACE ALL THE SCREWS!
The K3's chassis has excellent rigidity despite its light weight. The screws that hold the top
cover in place are an important part of the structural design. Please be sure to replace all the
screws and verify they are tight whenever you replace the cover or other panels
Replace the bottom cover(s) using the 4-40 black pan head screws you removed earlier. Note that three
locations take the 4-40 1/4” (6.4 mm) black pan head screws with lock washers as shown in Figure 2 while the
remainder are 4-40 3/16” (4.8 mm) screws. Be sure to replace all the screws securely, but do not over tighten
them!
CAUTION!
Failure to replace the three 1/4” (6.4 mm) screws and lock washers in the locations shown in
Figure 2 may destroy power transistors in your K3!
If you removed it earlier, replace the stiffener bar and attach it to the KPA3 shield with two 4-40, 1/4”
(6.4mm) zinc pan head screws with #4 inside tooth lock washers as shown in Figure 19.
Figure 19. Installing the Chassis Stiffener Bar.