classic fountain pen

Recently I made a pen out of walnut and lead from tirewheights. I cut a bunch of diagonal slots in the walnut and poured the lead into them. It turned out to be cool even if the metal dyed the wood a little grey. it came out almost double the weight of another pen of the same kit I made. Looking...

I would like to start making kitless pens like Mr. Fred Brunings but don't know the thread size for the Classic Fountain Pen from Penn State, or where to get the correct size die. I'm based in Ontario, Canada.