Jump to content
Classifieds is broken, please do not submit any new ads ×

Sheaffer Vac-Fil Blind Cap Unscrewing


Prolix
 Share

Recommended Posts

Hi! Perhaps a noob question, but I couldn't find anything in the forums that addresses this particular issue.

 

I have a circa 1940 Sheaffer Balance Vacuum-Fil that works great, with one exception. Every time I unscrew the blind cap to pull out the plunger rod, the cap unscrews not just from the body of the pen, but also from the end of the rod. I'm afraid that if this happen repeatedly, the screw will be stripped. What is the best way to safely secure the cap without causing damage or doing something irreversible? I could just super-glue the thing, but that seems like a terrible idea. What is the best practices for this situation?

Link to comment
Share on other sites

  • Replies 7
  • Created
  • Last Reply

Top Posters In This Topic

  • fountainbel

    2

  • adyf

    2

  • The Pensmith

    1

  • Prolix

    2

Top Posters In This Topic

Don't use super glue or it will be extremely difficult/impossible to disassemble the pen in future. Apply a little shellac to the threads at the end of the plunger rod and then screw the blind cap on. Heat will soften the shellac should the blind cap require removal in the future.

Link to comment
Share on other sites

I honestly don't expect applying shellack will hold the filling knob on the (partly) stripped threads.

In my opinion the only efficient repair approach is to drill the threads out - diameter

3.5mm, 4mm deep - and make/install a Ketron Peek plug - diameter 3.55 , 4 mm long - having the original inner threads.

I've done so several times with excellent results.

Alternatively you could surely look out for a replacement filling knob.

Francis

Link to comment
Share on other sites

I have a love/hate relationship with Vac Fills. On good days, they slide together after restoration (and always with the replacement of the seal in the barrel capsule), and work brilliantly. On other days, always a problem including finding stripped threads in the blind cap. That problem is more prevalent on the "wobbly knob" variety possibly due to ill-informed owners (and prior owners), not accepting the "wobbly knob" concept and trying to over-tighten the aluminium threaded insert in the blind cap.

 

The advice of Fountainbel is entirely correct. Super Glue (not so "super") and shellac are not the answer. There is too much force placed on the blind cap for either method to work, disregarding the destructive aspect of applying Super Glue.

 

Hard work with kedron or as I often prefer to use, Delrin provided one understands it gluing limitations.

Link to comment
Share on other sites

I missed the part of the OP that said the threads were stripped, I thought it was just a simple case of securing the blind cap on the plunger rod with all threads in tact.

Link to comment
Share on other sites

I have a love/hate relationship with Vac Fills. On good days, they slide together after restoration (and always with the replacement of the seal in the barrel capsule), and work brilliantly. On other days, always a problem including finding stripped threads in the blind cap. That problem is more prevalent on the "wobbly knob" variety possibly due to ill-informed owners (and prior owners), not accepting the "wobbly knob" concept and trying to over-tighten the aluminium threaded insert in the blind cap.

 

The advice of Fountainbel is entirely correct. Super Glue (not so "super") and shellac are not the answer. There is too much force placed on the blind cap for either method to work, disregarding the destructive aspect of applying Super Glue.

 

Hard work with kedron or as I often prefer to use, Delrin provided one understands it gluing limitations.

 

And provided one has a tap to create the original threads in the repair plug for the rod. :(

Link to comment
Share on other sites

Thanks for all the responses!

 

To clarify: the threads are not stripped. The blind cap seats firmly on the end of the rod and doesn't wobble at all when it is screwed down. It just unscrews from the end of the rod every time I unscrew the blind cap from the body of the pen.

Link to comment
Share on other sites

Thanks for all the responses!

 

To clarify: the threads are not stripped. The blind cap seats firmly on the end of the rod and doesn't wobble at all when it is screwed down. It just unscrews from the end of the rod every time I unscrew the blind cap from the body of the pen.

In this case the thread fit was not "blocked"

You should screw the filling knob FIRMLY- till blockage- on the rod , so the shoulder of the rod - behind

the threads- axially contacts the filling knob.

As adyf rightfully suggested,applying a small amount of shellack on the threads could help to increase the loosening torque.

Francis

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share



  • Most Contributions

    1. amberleadavis
      amberleadavis
      37779
    2. PAKMAN
      PAKMAN
      30894
    3. Ghost Plane
      Ghost Plane
      28220
    4. jar
      jar
      26101
    5. wimg
      wimg
      25595
  • Upcoming Events

  • Blog Comments

    • Matthew TWP
      @Ruaidhri This was an absolutely wonderful bit of writing, and I hope that you're able to maintain the style once all of the medications are out of your system.  Take care and recover quickly!
    • Dr.X
      Very punny daniel
    • danielfalgerho
      These comments make me sad as I sympathise with Ruaidhri, having great difficulties in being taken seriously. Or being taken at all (no off-colors jokes, please!) In spite of overwhelming odds,  Ruaidhri -now I know how to spell it- made a courageous decision and stuck to it. I was diagnosed with a similar growth in a place I will not reveal. Oh, well, if you insist it was Mount Sinai Hospital. But I firmly intend to walk in Ruaidhri's footsteps, if he will let me, on my next visit to Dublin.
    • ParramattaPaul
      Reminds me of the day my associates and I developed a cure for all mankind's ills and mistakenly wrote it down with invisible ink.
    • AnneD
      Was that the end of the Laboratory? Somehow the exactitude created a fully destructive device, as always!
  • Chatbox

    You don't have permission to chat.
    Load More
  • Expiring Soon

    • By benbot517
      51 years and 11 months
    • By benbot517
      51 years and 11 months
    • By benbot517
      51 years and 11 months
    • By Okami
      51 years and 11 months
    • By Okami
      51 years and 11 months
  • Random Adverts

  • Files

  • Today's Birthdays

    1. AD356
      AD356
      (39 years old)
    2. aussielondon
      aussielondon
      (37 years old)
    3. brainlab
      brainlab
      (36 years old)
    4. Cloudwang
      Cloudwang
      (31 years old)
    5. desmonte
      desmonte
      (57 years old)





×
×
  • Create New...