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Interesting Blog On Why Some Twsbi's May Crack


Tasmith
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He used Polarizers to see stresses in the TWSBI's plastic which may cause cracking.

 

I remember using this technique on clear plastic items when studying photography:

 

http://daverea.com/2015/09/twsbi-eco-won

 

I'll have to break out a couple of my Polarizers and try this myself.

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Wow, that's really interesting! Thank you for sharing. My 580 is going plenty strong, but it's good to know* that I can buy the Eco without worrying about cracking in the cheaper model.

 

*caveats, n=1, etc.

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That might explain why my 580 cracked enough to loosen the piston mechanism from the barrel while just flushing it out. I definitely wasn't overtwisting it. I was *really* disappointed; I haven't had it for six months yet.

"Well, believe me, I calculated the odds of this succeeding versus the odds I was doing something incredibly stupid... and I went ahead anyway."

--Crow T. Robot, Mystery Science Theater 3000: The Movie

My Flickr, if you're interested

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Thanks for doing the test. I just ordered a clear model Eco. I was not too worried to start with, but its good to know.

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  • 1 month later...

I contacted TWSBI and they're sending a replacement barrel for the cracked one, although I can't say I cared for the insinuation that I subjected it to rough treatment since according to the rep, it would take “quite some force” and that they “do not just crack”. The research above certainly suggests otherwise.

"Well, believe me, I calculated the odds of this succeeding versus the odds I was doing something incredibly stupid... and I went ahead anyway."

--Crow T. Robot, Mystery Science Theater 3000: The Movie

My Flickr, if you're interested

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Ugh. The new barrel arrived, and it's the wrong kind. I couldn't get the piston mechanism into it without destroying it. Back to the email drawing board...

"Well, believe me, I calculated the odds of this succeeding versus the odds I was doing something incredibly stupid... and I went ahead anyway."

--Crow T. Robot, Mystery Science Theater 3000: The Movie

My Flickr, if you're interested

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  • 3 weeks later...

I should follow up -- I have the correct barrel now, and the pen is back in action, although I wonder if that new post might have been due to one of my emails referring to "well-documented cracking issues" after his initial implication that I had mishandled the pen.

"Well, believe me, I calculated the odds of this succeeding versus the odds I was doing something incredibly stupid... and I went ahead anyway."

--Crow T. Robot, Mystery Science Theater 3000: The Movie

My Flickr, if you're interested

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  • 4 weeks later...

I should follow up -- I have the correct barrel now, and the pen is back in action, although I wonder if that new post might have been due to one of my emails referring to "well-documented cracking issues" after his initial implication that I had mishandled the pen.

 

Guessing you spoke with Philip?

Selling a boatload of restored, fairly rare, vintage Japanese gold nib pens, click here to see (more added as I finish restoring them)

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