I've used a piece of drainage tube (plastic), piece of timber in each end (lose fit - allow for damp and swelling) then steel U straps through slots cut in ends. (timber held in by straps). Straps have holes in end for small padlock. Cable lock through straps and rack.(oh for a sketch, but presume you can follow the logic)
If bike goes down, holder should move enough to prevent damage to poles (my other concern along with security).
Used this for at least 10 years.
If someone really wanted to nick them they could - but deters theft.
Possible to get alloy tube perhaps to make even better.
Always wondered if the authorities wonder if I'm smuggling arms though - looks dubious!
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