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the threaded rod going vertically down into the wall
They are sitting on the little rubber donuts that electricians put in metal back boxes to stop damage to the wires. This helps to allow them to move a bit in case the threaded rod is not completely vertical.
It's 10mm threaded rod.
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Airhead
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Got it, cheers. If considering that fixing method how many courses / what length of "bury" of the rod into the wall would you suggest as a minimum? I suspect I would have to buy some longer drill bits.
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They are sitting on the little rubber donuts that electricians put in metal back boxes to stop damage to the wires.
Grommets.
But not this sort of Gromit.
NickCJ
Mr_Sworld
Thanks for this and the previous reply. I'm still not sure I totally understand what that picture is showing. Are the uprights sitting in "shoes" bolted down to the top of the wall, are the uprights thru-bolted into the face of the wall, or are they sort of hovering above it with the threaded rod going vertically down into the wall?