Partially fit the the tip into the tube. Note that it can sometimes be a very tight fit.

The entirety of the bottom rim of the tip should be house inside the tube WITHOUT fully seating the tip.

Apply super glue all around the exposed stem. (Be careful not to use too much or it could make a mess.)

Quickly push the tip the rest of the way into the tube by pressing or striking the tip firmly against a hard, flat surface.