Duofold Vacumatic Plunger Unit Parker Duofold Aerometric Fits MK I and MK

Fits MK I and MK II NOT MK III

These pliers do that job

periodic checks can be made by rubbing the object with a finger

Be aware that over burnishing will result in the metal of the nib hardening and may even become brittle and crack

For those of you how wish to repair your damaged nib

Duofold Vacumatic Plunger Unit Parker Duofold Aerometric Fits MK I and MKREPLACEMENT VACUMATIC UNIT FOR PARKER DUOFOLD PENS Colour of the plunger rod will vary. WHEN FITTING REPLACEMENT PUMPS MAKE SURE THE INTERNAL BARREL THREADS ARE CLEAR OF ANY DIRT OR OLD ADHESIVE. IF NOT WHEN REFITTING THE PUMP THE BARREL WILL BE STRESSED AND MAY CRACK.