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Are the fence posts concrete?
Recently helped (inept) friends relocate a washing line.
Inadequate handle they sourced to tie 'this' end of line to, was a bit too long.
My attempt to drill the required 6mm holes was spot on ....... for the thin bits of reinforcing steel! It ripped the cross-piece of the masonry bit straight out!
Friends got adequately secured washing line, I got new 6mm masonry bit.
csb.
Drilling down the central line of the concrete fence post should be ok.
Praise the whoever for d-limonene!