Parker 51 Shell in Black ballpoint repair Think of this tool as

Think of this tool as the Swiss Army Knife for your German big fatty pens

Cliff gave a lot of the pen repair people their start

A: Length: 1

Comes with 33 ballpoint pens and pencils

Parker 51 Shell in Black ballpoint repair Think of this tool asNEW OLD STOCK BLACK SHELLS HOODS FOR PARKER 51s. Fine thread for standard size 51s. These are 48 threads per inch. These come in 3 sizes of inner recess for the O ring to fit in. Dale's not sure why they come in different sizes. It doesn't matter, as you don't really need the front O ring. The pen won't leak without the o ring, so the o ring is unnecessary. **Note: These will not fit Demi size pens.