My little Elmers Glue bottle has a rounded tip, but if I barely loosen it, just a little glue comes out. For the Alene's OK to Wash It, I did purchase some metal tips online (no store had any including craft stores). None of the three fit on to stay. Someone suggested taking apart a mechanical pencil and using its plastic tip. I had to tape it on but it worked well! Now I've learned just to make the tiniest hole in glue bottles and use an old SM needle to put in it between uses.
If you really want to try the metal tips, PM me and they're yours for the price of postage - letter size envelope.