Originally Posted by SueN

Instead of buying expensive tips, get a cheap mechanical pencil. Unscrew the tip from the pencil, take the orange tip off the school glue bottle. With a pair of non-fabric scissors, snip the tip off the school glue bottle. Start with just a little snip, see if the mechanical pencil tip fits. If it is too big, cut a bit more off the bottle. Keep snipping until it fits fairly well. You may get some leakage around the edge, but don't worry, the glue will self-seal the crack.