Thanks to all for responding - using a 7mm round grip for 2 cables keeps the
cables in place whilst allowing them to slide through - but I decided that
this was fine for this application. No real need to fix them firmly.
Special mention again for Christian's tip of drilling a starter hole for the
nail - working well so far!
Variation on a theme, to secure a cable once I drilled holes in the pointing
an inserted wood dowels then nailed to these. Made my own clips to do the
job with some scraps of lead I had hanging around cut into thin strips.
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