I occasionally grind off the point of a hypodermic syringe needle to make a precision oiler. This is a pain with a file, a mess with a grinding wheel that is too coarse, and trouble to get out the Dremel with a fine cut-off wheel. Regardless, it would then need time with the diamond hone or stone to smooth the tip.
Today I tried the CBN wheel for this - wow, about 10 seconds and it was done, clean and smooth with no burrs. This was easier and quicker than other methods.
This one was for a little TriFlow with teflon to lube shafts on some optical equipment.
oiler.jpg
If you work with miniature mechanical things or just need to get a tiny drop of oil in a tight spot and haven't used a syringe for this it might be worth a try.
Note, certain oils may eventually degrade the rubber plunger tip in disposable syringes which is why the better oilers I use have a glass body and plunger. I'll throw this one away after a bit. (There are hundreds more in my medical cabinet in the barn.)
JKJ