HI, this is my tip on a precision oilier. This is how I have made some of my own up.( SOS no pics right). Keep all your run out ball point pens. The bit you need to keep is the bit that holds the ink and the tip. Type 1 is remove the ball from the tip a touch on a bench grinder or Dremel will soon remove the ball. Then clean out the tube and tip with alcohol. Once clean, cut the tube to the length or leave it long, it's up to you. Then you can go to your nearest hair stylist, or ask the wife to do this for you, and ask them for the used bottles they have used to apply dye to peoples hair. They threw them in the bin once they have used them. Fetch them home. Put on the wife's rubber gloves as the dye is a sod to get off your hands. Then you will need to cut the top of the bottle so that the pen tube is a nice fit and glue in place. Type 2 is the same but remove the tip of the pen all together and fit it to a brass tube. Found a pic of one that I made out of a piece of copper tube (see the bit outlined in red.)
krv3000, proud to be a member of MetalworkingFun Forum since Feb 2012.