Elecraft K3 Assembly Manual - Manual (Page 14)

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Install a 4-40 3/8” (9.5 mm) standoff on the RF board near connector Z1 as shown in below and Figure 11
on page 16. This standoff will support the mixer to be installed later. Install the standoff using three lock
washers as shown below with two of the lock washers between the standoff and the RF board.
CAUTION: To avoid damaging the circuit trace between R74 and the metal ring around the mixer
standoff screw hole, position the lock washer under the screw head with the split facing away from the
trace, then tighten the assembly by turning the standoff while holding the screw and lock washer
stationary.
Figure 7. Installing Mixer Standoff.
Install the two KBPF3 standoffs shown in Figure 8. Even if you didn’t purchase the KBPF3 general
coverage option, the standoffs and hardware are included in the K3 kit to make installing the option easier at
some future date. Note that these standoffs have only one lock washer between each standoff and the RF board
Note that one standoff is very close to the toroid coils. The standoff may touch the coil. That will not
affect circuit performance. If you wish, you may adjust the position of the coil slightly to avoid contact. .
Figure 8. Installing KBPF3 Standoffs.