mo submitted this idea :
Very very good idea and pretty much perfect.

Any tips on how big a screw you would use for a 10cm post ?

You wouldn't use screws, you would use Rawlbolts - 8 or 10mm. No need
to counter-bore, just use threaded rod in the Rawlbolt, with a nut.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk