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Thank you. Yes, I do need to ground two of the mounting holes. These things are simple when you know how, but not if you don't. There are several steps to get exactly right.

Kicad has always understood mounting holes, and it really is very
simple.?? Just add them to the schematic as symbols, as others have
said.?? It's always been possible to make your own symbols, or make use
of something out of the supplied libraries such as a single pin
connector symbol.?? If you want them to relate to specific screws, put
the part number for the screw in the Value field of the schematic
symbol, and the relevant hole in the Footprint field (eg M3-HOLE).?? Now
when you export the BOM, it will be complete with part numbers for the
screws.

Note that by placing mounting holes in the schematic, you can optionally
connect them electrically to something, such as chassis ground
(filtering components are often connected to chassis ground rather than
signal ground).?? The schematic is very much the place to have the
mounting holes defined.

Regards,

Robert.

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Best Wishes
John Woodgate
Keep trying