Ramrods don't have threads on the wood to screw into the brass end. The others are right. The threads inside the brass end are only there to give epoxy something to grab.
Actually, relying on epoxy without something else is a bad way to go too. The best way is to epoxy the tip on and then drill a cross hole thru the tip and the wood that's inside of it.
Here is a brief discription of how I make a ramrod with a brass tip.
To do this, I use a Exacto or other very sharp knife. I also need a flat metal cutting file or a block of wood and some sandpaper along with a electric drill and a 1/16" drill bit. A nail or center punch and a small hammer are also useful. You will also need a short piece of brass wire, 1/16" in diameter and some wire cutters.
Brass wire can be bought at any good hardware store for a buck or two.
1. Measure the depth of the hole inside the ramrod tip.
2. Subtract 1/16" from the measured value and using a pencil, a pen or something, make a mark on the ramrod wood measuring from the end of the rod.
3. Lay the ramrod wood on a table and place the cutting edge of the knife on the mark. Now, roll the ramrod away from you while pushing down on the knife blade and keeping the blade at 90 degrees to the rod. You want to cut into the wood a little deeper than 1/32" all the way around the rod.
4, Using the knife and cutting from the end of the rod, cut a small 45 degree chamfer down thru the wood that is going to be removed making the cut intersect the circumfrencial cut you made in the rod. This should leave a nice, sharp corner for the brass tip to butt up against. The purpose of this cut is to give a small shoulder for the file to bump up against while your removing the wood for the tip.
5. Using the file or sanding block, start filing (sanding) the wood area that's going to go inside the brass tip. Rotate the rod as you do this to try to remove an equal amount, all the way around the rod. When the filed area starts getting down to a size that will fit in the brass tip, go more carefully. You want to end up with the wood size being something that just bearly fits inside the tip.
6. Mix up some epoxy and coat the filed area on the wood and the inside of the brass tip with it.
7. Slide the tip onto the rod pushing it on until it hits the shoulder on the wood and set it aside to cure.
8. Using a small nail or center punch with a hammer, tap a small indention about 1/8" from the shoulder into the brass tip.
9. Using a 1/16 drill bit and the indentation to keep the drill from "walking", drill straight down thru the brass tip wall, the wood and thru the other side of the brass tip.
10. Use a pocket knife or the hobby knife with a tapered blade to form a small countersink in both sides of the hole in the tip. Just put the tip in the hole and rotate the knife around and around to do this. It doesn't have to look pretty.
11. Cut the brass wire so that it is about 1/16" longer than the diameter of the brass tip and push it thru the hole so an equal amount sticks out of both sides.
12. Place one end of the wire against a hard surface and using the hammer, lightly tap the upper end of t0 form it into the countersink. Once it is slightly mushroomed, turn the rod 180 degrees, place the mushroomed end of the wire against the hard object and then mushroom the exposed end down like you did the first end.
13. Using the file, remove any of the wire that is still sticking up above the outside of the brass tip.
Your done.
Below is a sketch of what the pinned tip should look like