John,
I'm not Apollo (nor do I pretend to be him on TV

), but I accidently pulled the nib on my Wality 52 on either Sunday or Monday night, actually I completely disassembled the pen, including removing the piston.
Note: I do not necessarily recommend doing what I did, I may have just been very, very lucky.here is how I did it
1) I flushed the pen with some cold water
2) was not happy with the ink that had crept behind the piston (how did those droplets get there

)
3) I grabbed the nib with a papertowel, held the section and gave a pull and twist. The nib came out suprisingly easy. Be careful, the nib and feed are not connected (you learn something new everyday, unless you are really careful)
4) I flushed the barrel with cold running water & got the brilliant idea of removing the piston.
5) I unscrewed the piston, as if I was going to fill the pen. When the piston was fully forward I kept unscrewing and the back part where you hold and turn came off.
6) I got a blunt implement and pushed the piston through the back of the pen.
7) washed everything out & let dry
8) re assembled by doing what I did in reverse order
9) filled the pen & let it sit in an empty coffee mug nib up overnight
10) the mug didn't have ink all over the bottom the next morning, and the pen still wrote a nice line. I decided to give the pen a real world test and take it to work in my pocket. So far so good, no inky pocket and the pen still writes well.
I hope this helps. I omitted the under my breath mutterings that highlighted this exercise.
French