Parker 51 Shell in Black ballpoint repair Note: Pentooling measures nib grades

Note: Pentooling measures nib grades on a Parker factory nib grader

BROAD/MEDIUM WHAL/EVERSHART GOLD SEAL SIGNATURE NIB

BUT WITH LONGER HANDLE

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Gives your pens a hard shine

Parker 51 Shell in Black ballpoint repair Note: Pentooling measures nib gradesNEW 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.