Propelling pencil kit

[Grump]

Looking through the list supplies by Brian I saw these, http://www.pennstateind.com/library/PKRAHAN_PKTBHAN_INS.pdf
Any one made these?
Where do you get the T/Brush heads from?

I have never made one nor do I fancy the idea of it but seeing as it's their library I would suggest them as a good place to find one
Penn State Industries | Pen Turning | Pen Kits | Dust Collector

 

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Just thought they would make good Christmas pressies to people that I have given too many pens to.