Stringy and Tony have convinced me that I need to get a wind indicator. I had a look in the shops but the small range that I saw didn't look to be robust enough, so I thought I'd knock one up myself.
This is what I came up with:
Cable tied a PVC end cap to the end of the mast. The brass fitting is a male pneumatic connector that is inserted through a hole in the cap and epoxyed in.

The indicator is a cut down arrow with a broadhead. The brass fitting here is the female pneumatic connector.

The pneumatic connector not only makes the indicator secure but is ideal for easy removal.

I took it for a drive, hanging it out the car window, and it worked great. The tension on the lock nut at the top adjusts the friction so that it's not too sensitive and has some resistance. In these shots it looks huge but it's only 250mm long and in the flesh it looks fit for purpose. I do like the quick connect function even though the pneumatic connector does add extra weight to the design.
As long as it stays up there

and doesn't pay me a visit, I'll be happy.
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Don't take life too seriously................it ain't permanent.