How old is "too" old for aluminum cylinders?

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I am out on Kauai and on my morning walk there's a neighbor with a mailbox that is a polished metal pipe .... it got me thinking about repurposing a steel 72.

Cut the top off, weld on a hinge and a latch, add a small dive flag mail signal...mount it on a post. How cool would that be? It's on the to-do list :)

Edit ... of course I'm not the first to think of this LOL

View attachment 854578
I too have a dive flag on my mailbox...
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I am out on Kauai and on my morning walk there's a neighbor with a mailbox that is a polished metal pipe .... it got me thinking about repurposing a steel 72.

Cut the top off, weld on a hinge and a latch, add a small dive flag mail signal...mount it on a post. How cool would that be? It's on the to-do list :)

Edit ... of course I'm not the first to think of this LOL

View attachment 854578
What's with the mailbox on the ground?
They have very short people living there?
 
https://www.shearwater.com/products/perdix-ai/

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