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4litre

Can anyone tell me, are all Parker 51 nibs compatible with all Parker 51 pens?  More specifically, are the later 1960s-70s nibs with a hole towards the rear end compatible with the feed assembly on earlier Aerometrics ?  Or did Parker maybe give the feed a wider diameter on later pens, so that a nib from one of these pens will be too loose on the feed of an earlier Aerometric?

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IThinkIHaveAProblem

AFAIK a nib from an early (vac or aero) "51" will fit just fine on a later "51". In fact will only very little modifications, the nib from a 61 can be used on a "51". I've never seen a nib that was a different diameter in any of my more than 2 dozen "51"s. That includes Demis and full size pens, in my experience, they all have the same size nibs.

 

This DOES NOT APPLY to the new 51NG that Parker is currently peddling in 2021 and I don't know if it applies to the 2001 SE 51 (I suspect it does not, but I don't know for sure)

 

Someone pls correct me if I am wrong.

 

 

Just give me the Parker 51s and nobody needs to get hurt.

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4litre

Many thanks for this response; I thought that ought to be the case.  However, I have this italic nib (sorry the photos are a bit so-so) which was working fine in an early 1970s English P51 Mk III, but when I try and fit it in a 1952 English P51 Aerometric it's loose and wobbly. This is what made me wonder whether the feed in the Mk III, at least, has a slightly greater diameter.

Nib 1.jpg

Nib 2.jpg

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The vintage 51 nibs will fit the 51 pens made up through the 1970s. 

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Visit Main Street Pens
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IThinkIHaveAProblem

wow.. that is a nice big blob of tipping on that nib... very jealous...

 

when you say loose and wobbly, did you swap over just the nib? the nib and feed, or the nib feed and collector?

(trying to isolate where the looseness/wobblyness is)

Just give me the Parker 51s and nobody needs to get hurt.

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4litre
5 hours ago, Ron Z said:

The vintage 51 nibs will fit the 51 pens made up through the 1970s. 

And vice versa?

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4litre
5 hours ago, IThinkIHaveAProblem said:

when you say loose and wobbly, did you swap over just the nib? the nib and feed, or the nib feed and collector?

(trying to isolate where the looseness/wobblyness is)

 

Just the nib -  I thought the feed and collector was redesigned for what I call the Mk III pen (1969 on, with the squared-off barrel).  So the looseness is between the 1970s nib and the early 1950s feed/collector.  I think perhaps it doesn't help that the later nibs, apart from the two wings right at the base, don't wrap around the feed as much as the earlier nibs do.

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IThinkIHaveAProblem
3 hours ago, 4litre said:

 

Just the nib -  I thought the feed and collector was redesigned for what I call the Mk III pen (1969 on, with the squared-off barrel).  So the looseness is between the 1970s nib and the early 1950s feed/collector.  I think perhaps it doesn't help that the later nibs, apart from the two wings right at the base, don't wrap around the feed as much as the earlier nibs do.

i think you may be right WRT them not wrapping around quite as much being the source of the looseness. 

 

Just give me the Parker 51s and nobody needs to get hurt.

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4litre

Thanks, both, for your contributions.  It looks to me as though that nib is going to have to go back into a Mk III pen.

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33 minutes ago, 4litre said:

Thanks, both, for your contributions.  It looks to me as though that nib is going to have to go back into a Mk III pen.

 

Does it fit the original pen without wobbliness?

 

I'm surprised more tech people haven't weighed in on this subject. It should be able to fit any 51.

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