Jackdaw-proofing.

I nearly said " We accidentally bought...." but we didn't. In fact the lack of rustable kind of appealed - BUT ...I/we didn't realise how "nesh" the perches were when perched on by a Jackdaw, or Cushat.
The result of such a perch is that said perch ends up either hinging down, parallel to the side, or on the deck. I had the idea that, maybe if they were Sparrow-sized they might be better and Cushat proof.
Experience suggests I may have been right. Wazzack that I am I put the long one back before I shot it - PILLOCK.