Have you already seen our nifty little R2B Rollerball to Ballpoint Conversion Kit?
I call it the Cadillac of pen conversions! Wouldn't you just love to be able to use your favorite Rollerball pen like a Ballpoint pen? Perhaps some of the daily writing tasks require you to "press hard" to copy through multiple pages, but you are not ready to give up your beautiful Rollerball for another pen. Well, there is a solution for that now!
This 3pc R2B Kit consisting of a spacer, extender and tension spring will allow you to keep your pen, and be able to use a Ballpoint or Gel ink refill (Parker format) in it. This kit works with most rollerball pens on the market, but non-standard models will require a little extra innovation and tweaking to overcome the extra lengths we come across in some pens such as the Parker Rollerball. But, as long as your refill does not exceed a length of 11cm or 4 3/8" you will have no troubles at all.
You will have a wide variety of choices available to you: