Drilled four #10 holes for mounting Garmin GEA24 on sub-panel. Drilled #40 holes for nutplates for the 10-32 panhead SS screws I'm using. Also machine c'sunk ACK's "ELT switch" to change the supplied 4-40 brass panhead to black flat head screws...so flush and "disappear" on instrument panel when mounted.
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