I attempted it a few years ago, but never was happy with the results. I made it something like I make the pen for the sharpie refill and it was too bulky. I'll try and dig up the pictures.
Cross makes a yellow chisel point highlighter refill. It the same size as the old felt tip refills were. Check out the Cross pen site. I have used one for a number of years know.
Ron
Thanks for the input. I found the one on the Cross site for $5 each. I'm going to order a couple to see if they will work. I appreciate the responses.
WB