See if you can get a fine stone or an abrasive rubber bit to fit in your roto tool, or as suggested use sandpaper.
Depending on how rough it is, sandpaper could take awhile.
A fine jewlers file would work also.
I used a pointed carbide burr when I did mine and they came out good.
Make sure you move the tool in the direction of rotation and not against it to get a better finish.
Don't know if you can get wider ones from Okuma but it might be worth a call to them.
Good luck
Glen