So inspired by southernexposure's sugru drip thingy, I thought I'd try something easier/cheaper, as I am both lazy and cheap
Quick and dirty test! This was so successful, I didn't wholeheartedly test any of the other options. I will eventually... I'm not quite sure how confident I am in how long wearing the earbud tip is.
Anyway, this is easy to remove, should be reusable/replaceable (though not easily in the field) and basically free!
So I got home tonight and rooted through some drawers till I found a broken pair of earbuds and some worn out whoopies. I pulled off one earbud tip and threaded it into the whoopie (open side towards tree) without much trouble.
After a drip test, I found the opening of the earbud tip was just a little too big; at anything past a light flow, water would start dripping down through the hole.
So I dug out some silnet, and dabbed a bead onto the convex side of the earbud tip, rotating it around the whoopie sling as I did so to ensure a seal. After a few minutes' drying time, I wasn't able to get water to drip past the earbud tip at all, unless the angle started approaching 75 degrees or so.
The plastic funnel I actually did test; i don't have a tiny one, like those used for perfume, so i knew this one was already going to be too big. On its own it is too rigid and the opening too large to be useful, but combined with the earbud tip (thread the tip on first, then jam the funnel onto the whoopie until the earbud tip seals off the funnel neck) it is essentially waterproof, up to and including 90 degrees vertical.
I imagine the best all around solution, but not one I want to cut up our only bulb syringe for, is to simply cut the bulb of the syringe in half and use my splicing tool to pull the whoopie sling through the neck, trimming off the neck until it is the perfect sized opening.
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