Here's how I do it. You can find the few supplies (apart from the tip) at any hardware store.
The hard part is getting the old tip off and the pad (see Lou's post) clean and flat. Take your time. The last step of cleaning the pad is to scuff it with sandpaper. You need to be careful not to round the edges of the pad.
Select a tip. It should be a larger diameter than the pad. Sand the bottom of the tip to get to a flat, glue-able surface.
Using Scotch Magic tape, build the shaft up to the same diameter as the tip. Be careful to get the tape up to just barely below the level of the pad.
Apply Super Glue gel to both surfaces, spread with a bent paper clip, press on and squeeze and turn, centering the tip by making it match the Scotch tape all the way around. I then keep pressure on the tip for about 15 minutes by putting it tip-down on the floor with some weight on top.
Remove the Scotch tape. This should remove any extra glue.
With a very sharp knife, carefully trim the tip to be almost even with the shaft. Take your time. (Or try the trimmer Lou mentions, but I've never used one.) Don't trim it too far -- the final trimming is next.
Wrap one layer of tape around the ferrule just up to the pad. Assemble the finishing fixture from typing paper, a square block of some kind and #220 (or so) sandpaper as shown:
![CropperCapture[13].png CropperCapture[13].png](https://forums.azbilliards.com/data/attachments/106/106966-c0868888ef40a14056485694c141fed4.jpg?hash=wIaIiO9AoU)
The plain paper should be wider than the sandpaper and taped to the table. Move the block so that the gap between the block and paper is just wide enough for the tip to contact the sandpaper but not the ferrule.
Rub the tip on the sandpaper while rotating the shaft. As the sandpaper fills up, slide the sandpaper to get a new part. Continue until the side of the tip is even with the ferrule. The stop-point is automatic since the paper and the tape around the ferrule will keep you from going too far. You may want to switch to #400 sandpaper towards the end. You can elevate the joint end of the shaft a little with a towel to get a slight bevel on the side of the tip.
Shape the crown of the tip, perhaps with the remaining good surface of the #220. Burnish the side of the tip with your usual method. Remove the protective tape.
Needed: Knife, sandpaper, glue, tip, Scotch Magic tape, small, square block, paper. You can substitute a CD jewel case for the block.