Jump to content

The Fountain Pen Network uses (functional) cookies. Read the FPN Privacy Policy for more info.  To remove this message, please click here to accept the use of cookies

Registration on the Fountain Pen Network

Dearest Visitor of the little Fountain Pen Nut house on the digital prairie,

Due to the enormous influx of spammers, it is no longer possible to handle valditions in the traditional way. For registrations we therefore kindly and respectfully request you to send an email with your request to our especially created email address. This email address is register at fountainpennetwork dot com. Please include your desired user name, and after validation we will send you a return email containing the validation key, normally wiithin a week.

Thank you very much in advance!
The FPN Admin Team


Almost Cracked Sac

rubber sac crack repair parker converter glue glueing

  • Please log in to reply
4 replies to this topic




  • Member - Gold

  • PipPipPipPip
  • 67 posts
  • Flag:

Posted 04 September 2014 - 12:55



I have an old Parker squeeze converter which at first sight seems to work well, holds a lot of ink and is not leaking.

However when I squeeze it the rubber has some cracks in one part , the rubber is not yet cracked completely but sooner or later it will. I can still use it and it also feels flexible.


I was thinking if there is any preventing work or something. 

Can I melt the rubber with the  hot red point of a needle so the crack is no longer spreading ?

Or can I glue it somehow?


Thank you!

Sponsored Content

#2 Pickwick



  • Member - Gold

  • PipPipPipPipPipPipPipPipPip
  • 1,932 posts
  • Location:California

Posted 04 September 2014 - 13:14

Your only solution is to replace the sac. Once rubber starts to deteriorate there is nothing you can do to stop it.

They came as a boon, and a blessing to men,
The Pickwick, the Owl and the Waverley pen

Sincerely yours,


#3 Garageboy


    Donor Pen

  • Member - Gold

  • PipPipPipPipPipPipPipPipPipPip
  • 4,494 posts
  • Location:Brooklyn NY

Posted 04 September 2014 - 13:21

Don't bother- use it til it leaks and resac (easier solution is to replace it with a modern twist converter)

Edited by Garageboy, 04 September 2014 - 13:23.

#4 Ron Z

Ron Z

    Museum Piece

  • FPN Super Moderators

  • PipPipPipPipPipPipPipPipPipPipPip
  • 9,985 posts

Posted 04 September 2014 - 13:43

As has been pointed out, there is nothing you can do to forestall the failure of the sac.  You do want to use something though, because it will fail sooner rather than later, and when it goes you'll have ink everywhere.  Unless there's some reason why you want to keep the old converter going, or you can replace the sac yourself, buy a new converter.  Most guys charge $15 for a basic resac, even of a converter, and a new one retails for $10.  


Getting the nipple out without damaging it can be a challenge.  Use the back end of a drill bit that fits in the center of the nipple to support it while you work the plug out out of the barrel.  I would install one of the PVC sacs from Woodbin so that you don't have to replace it again.  Not certain which size, but I would try a #16 or #18.

Visit Main Street Pens
A full service pen shop providing professional, thoughtful vintage pen repair...

Please use email, not a PM for repair and pen purchase inquiries.




  • Member - Gold

  • PipPipPipPip
  • 67 posts
  • Flag:

Posted 04 September 2014 - 19:43

I understand, I will use it as long as I can. And I will buy a few cartridges just in case.

Thank you for your replies!

Also tagged with one or more of these keywords: rubber, sac, crack, repair, parker, converter, glue, glueing

Sponsored Content