Leaky Pelikan 30, P30 or M30?

[whych]

The M is for piston and P for cartridge.
The pen is an M30, rolled gold. They did 2 nib styles. This is the early style.
You pull the nib and the feed together.
First soak the pen and clean it properly to get all the old ink out. You can fill it with water and leave the whole pen in water.
To pull the nib and feed, use a toothpick with a bit of the sharp end cut off and screw it into the hole on the back of the feed and pull both the nib and feed together.
The nib thickness is on the hidden part of the nib.
The thread on the piston sleeve is left hand, so you turn it clockwise to unscrew. If you do unscrew it, don't unscrew the piston from the filler knob or else you end up with a problem aligning it all when you put it back.

If it is leaking, it could be that the piston is too high in the body and needs to screw in a bit more.