[Elecraft] KPA500 PA/LPF module mounting instruction problem

[Carol F. Milazzo, KP4MD/W6]

While building the KPA500 I found that the ten mounting holes on the PA/LPF
module heatsink were not tapped deeply enough to accommodate the five 4-40
1/4" screws specified on page 22 of the assembly manual, nor the five 4-40
5/16" screws on page 24 of the manual.
I had to use the 4-40 3/16" screws in both cases.  If I had used the screw
lengths as the manual specified, the module would be loose and insecurely
fastened to both the Z-bracket and the right side panel.