Darren Scannell of the Resin Shipyard demonstated this technique several years ago at an IPMS Nationals
http://www.resinshipyard.com/pages/tip_pages/glue_tips.html
He uses Teflon radio-control control sheathing tube and stretches it like you would a piece of sprue (Didja know that when you stretch sprue the shape remains? Square remains square, but finer. A tube remains a tube, but finer.)
Put the unstretched end of the tube over the spout of liquid CA. The hair thick tube delivers a pin-point sized drop with good control.I use this to run a bead of glue along the gutter rail of PE railing.
Teflon is not affected by the glue. But if the tip clogs just nip back to a good point, often 1/8 inch or less.
I bought a 24" inch length of RC tubing for less than $5.00 at the local Hobby Town and was able to make a couple dozen tips.