A small S/Steel hip flask I bought from a charity sale was made into a nice precision oiler for small parts and parting off operations, it has enough flex to deliver the right amount with a gentle squeeze. A small bore brass tube from a defunct CO2 pistol was soldered into the brass cap, (I always dismantle items before binning them to see what can be used). I have filled it with ATF fluid which I find suits for most uses.
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