If your "new" 51 doesn't respond to this Nuke FlushNSoak, you'll need to break it down yourself and resolve the issue(s) or send it off to a restorer. At least you'll know then the problem ISN'T it just being ink clogged.
Here will be my Parker 51....I will need help when it arrives.
Do some searches here on disassembling P-45s. The nib unit unscrews right out and breaks down to it's parts easy peasy.
Bruce in Ocala, Fl
I have taken the four Parkers for a bath and doing a fair bit of soak and flush today. The P51 I suppose is in good shape, not that I even dipped it to check the nib. The positive of the pen is the sac is in shape to hold ink. Now deciding to resac it or use it with a probability of failure will nag me.
The Parker Duofold which is so tiny compared to modern ones is in poorer shape. The filler is clearly toast and is devoid of the mechanism to allow me to press and fill the pen. It will be tempting to see if I fill it like eye dropper style if it holds any ink and gets the feed working.
Finally, of the most potential interest to me is the P45 I think which turns out to be labeled a broad nib, and I love broads!
I may as well try them tonight and will start a new thread to post to and come back here if nuke and flush and more dismantling research and advice is needed.