He repurposed the spray nozzle from a commercial spray paint ... He used Sugru to attach it to the bottle cap which has a hole drilled in the center to accept the feed straw.
How To Fix A Spray Bottle That Isn't Spraying Swapping your spray paint's nozzle is trivially easy to do. With the canister's cap removed, you can pluck that spraying nib right off the can ...
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