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51Vac problem

I picked up a 51 Demi Vac and now that I finally got it flushed out, I have found a problem when I inked it. When I start to write it leaves a blob of ink after 1-2 letters. It draws ink like it is supposed to and doesn't leak out the plunger. Need some ideas as to probable causes.



Fridays are Fishtastic!
Is it a redband filler or no? With the original design, you were supposed to hold the plunger down when removing from the ink to prevent this. Here are filling instructions for both.


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Cheaper than ink
Air leaks usually cause blobbing. You should go through the pen and replace the diaphragm if you don't have any history on it.
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