Elecraft KPA500 Kit Assembly Manual - Manual (Page 33)

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Insert the transformer mounting bolt through the bottom cover as shown in Figure 46. If the fit is very tight,
temporarily loosen the screws holding the transformer support plate (Figure 31) to better align the holes. Some
fender washers have a sharp edge on one side caused by the stamping process that cut the washer out of a
larger sheet of steel. It may not be visible, but it is easy to feel by testing the edge on both sides with your
finger. If present, orient the washer with the sharp edge toward the bottom cover.
Tighten the hardware
securely and check to ensure the bolt head is tight against the bottom cover.
Figure 46. Installing the Transformer Mounting Bolt and Bottom Rubber Disk.
Place one of the rubber disks on the bolt and move it down against the bottom cover. The nut and washers
will be under the disk as shown in Figure 47.
Figure 47. Installing the Bottom Rubber Disk.