You can make Both, but I am guessing you need a rod since installing the old tip on the broken rod will make it too short ?
You can make a tip out of a empty cartridge brass or buy one. They only cost about $ 1.50 - $2. Tho I have made several from sheet brass they are more trouble than worth for the $1.50 investment (IMHO), unless ya just want to say ya make it. Buy the RR tip for the size ya ned, ream out the RR pipes a lil & it will work.
As for the putting the tips on the rods, just buy a new hickory RR & tip from one of the vendors & have at it. I prefer to have a tip on both ends of my ramrods. Here are the installation details:
I take the rod to a belt sander & sand off the measured end of the rod as I rotate it on the sander til I have it sanded down to where it will barely go all the way into the RR tip. Then I take a piece or emery cloth & roll it up & put it in the tip & twist the emery cloth in the tip to roughen the insides a bit.
Next I take a countersinking tool & I bevel the inside of the RR tip edges just a tad.
I take a round wood file & I make a couple light file marks in a spirial form (like a barber pole stripe) on the sanded wood surface where the tip goes over the ramrod.
Now take a piece of posterboard & cut a small circle of it & put the small dot of paper into the end of the RR tip to block the end of it where the threads start. Mix up some epoxy or microbed & put some in the hole & some on the sanded ramrod end. Push the ramrod end into the tip & twist it on tight forcing the excess glue out. Wipe off excess & let dry overnight. Stand on end with tip down.
After setting all night, take a auto centerpunch & make a punch about 1/4" from the wood/brass edge in the center of the tip. Drill it with appropriate sized drill for same size hole as a #3 finish nail or a piece of brass 1/16" rod. Drill it thru & then take a countersinking bit & bevel the edges of the holes you just drilled. Insert #3 finish nail or brass rod & tap it in snug against the head & clip off the excess with a pair of sidecuts or needlenose pliers, leaving the head on one side & 1/32" of shaft on the other side (on the brass rod leave 1/32" sticking out eaddh side). Put the nail head on your vice & on side sticking up peen it over carefully with a small hammer. File flush turn over & file down nail head flush. Do the brass the same way, peening one side & then turning over & peen the other side.
Don't hit it too hard or you will distort the RR tip & make it out of round. It doesn't take hardly anything to hold that pin in so just a lil peening is enough.