If you are familiar with Bondic adhesive, you know it comes in a black plastic tube that has a pinpoint applicator built in.
If you are not familiar with it, google it. It is basically a liquid plastic that solidifies under ultra-violet light. A small UV flashlight comes with the kit.
Great stuff has many uses. Dentists use something similar to fill your cavities. One unforeseen use is the little black plastic tube once you run out of the liquid plastic.
Do not throw it away. What is left of the glue can be dissolved and removed as long as it has not been cured under ultra-violet.
What you end up with is a nifty little pinpoint oiler that you can fill with your favorite lubricant.
Just soak it in denatured alcohol. Handy for taking along to the range.
Just a little bigger than a carbine oiler and free as long as you use the adhesive.