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Shrink Tubing To Reinforce Cracked Cap?



AppendixC

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I just got my first vintage fountain pen, a short Sheaffer Balance. Because of its size, I would prefer to write with it posted, but it already has two hairline cracks at the open end of the cap. I was thinking of using a small length of heat shrink tubing and putting it over the end--covering the gold band and going to the end of the cap--to help hold everything together. Do you think this will provide enough reinforcement to allow me to post the cap and keep the cracks from growing?

 

If others have done this, are there special considerations or hints you'd be willing to share?

 

(I have seen the forum posts recommending MEK for crack repair, but in my understanding, even if I repair the cracks with MEK, new cracks are likely to form if I keep posting the cap because of the thinness of the lip.)

 

Thanks all!

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The danger is heat.

To use heat shrink, you need to apply heat, and can you keep the heat from damaging the cap?

San Francisco Pen Show - August 28-30, 2020 - Redwood City, California

www.SFPenShow.com

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I did not realize that the melting temperature of celluloid is lower than the shrink temperature of heat shrink. I haven't been able to think of a way to keep the area directly under the heat shrink from getting too hot.

 

But how much of a danger is it? Soap is routinely heat-shrink wrapped, and it also has a melting temperature of about 140 F, the same temperature as celluloid. If I just heavily masked the non-treatment area of the cap and stuff the inside of cap with paper, would that be enough protection for the pen?

 

If not, what about cold shrink tubing? Or would that be too flexible?

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I dunno.

I've use matches, heat guns and soldering guns to shrink heat shrink tubing.

And when I make a mistake, I can fix the wiring with varying degrees of difficulty, but I can fix wiring.

San Francisco Pen Show - August 28-30, 2020 - Redwood City, California

www.SFPenShow.com

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