It's a shame that the actual roller ball pen is so bad.
So this is how to fit a Bic Fine line (a personal favourite) instead.
Step 1: It's a Nice Pen But
It's very comfortable....but
Step 2: The Rotten Refill
It's a really primitve rollerball.
And to make matters worse, this one is blue!
Step 3: Make a New Refill From a Bic Fineline
I'am a professional artist and despite the number of pens I use, one of these blighters is never out of my hand.
But it's way too long to fit here.
Junior Hacksaw please.
Step 4: Sawn Off
Now measure back from the front 31.5mm and saw the blighter off.
Step 5: How Much Ink Can You Fit on the Head of a Pin?
So scoop out some with a pinhead.
I do not know why but when I didn't do this there was ink all over the place.
could be surface tension,air pressure or room for heat expansion I can not say.
Step 6: Bung It Back In
it's pretty much trial and error.
And if you split the barrel then just super glue the thing together.
Step 7: Pop It All Together
Step 8: Nearly Done
Step 9: And There You Go
I know it isn't very complex but I am only really posting this as I was doing this on the day I found instructables.
It seemed appropriate.