Elecraft KPA500 Kit Assembly Manual - Manual (Page 7)

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Figure 1. Measuring Screw Lengths
Standoffs
A number of threaded standoffs are used. As with the screws and washers, be sure you use the correct size as
specified in the text. Standoff lengths are measured from end to end as shown in Figure 2. Standoffs threaded for
2-56 and 4-40 screws are used.
Figure 2. Typical Standoff.
Lock Washers
Two types of lock washers are used in the KPA500 (see Figure 3). It is important that you use only the type
specified and put the washers exactly where indicated. Adding washers or placing the washers in the wrong
position may cause parts to fail to fit together properly.
Figure 3. Lock Washers.