A roller cannot replace a ball pen even if it appears to fit. Ballpoint is a thick oil based ink that sticks to the ball. Rollerball ink is water based like FP ink. If flows around and through the ball. Even if it did fit, the uncapped rollerball would dry out and stop flowing within hours...
Gel inks are totally different, they have the qualities of both!
I didn't even think about the fact that rollerball pens need a cap!
I've never had - or used - a rollerball pen so didn't consider that factor - and how silly my original question seems now!
(....she slinks away....)
I am going to have to try a broad point refill and see how it feels to write with it in one of my ballpoint pens. I've never used a ballpoint with a broad refill before, either, so I have no idea if this will improve the writing experience or if it will be just more of the same. Sadly, if the pens end up being dust collectors, so be it.
I've already been spoiled by fountain pens!
Edited by OakIris, 25 March 2012 - 18:53.