Justin, Since Brian sells the meister nibs to penmakers I would assume he knows for sure what the thread size is, what did he have to say when you asked? His website says they are a direct screw in replacement for the Jr Gent and similar kits.
George this is what Brian said when i emailed him:
Hi Justin.
Sorry if I'm getting back to you late. I just returned from the DC Pen Show with little internet access.
Im trying to use the #5 feeds that i bought form you and need to know what size tap i need to buy to use your #5 feeds and am having trouble. Can you tell me the size of the threads on these #5 feeds and what size tap would be required for the threads.
I don't use taps or dies for pens, so I've never ordered one for my own use.
I can tell you the the pitch is .5mm. The major diameter is .250".
However, don't just send this information to a company to make you a tap.
I would recommend sending the housing itself to whichever company is making your tap.
This way, you take the responsibility of accurate specs off of yourself, and onto the company.
Best Regards,
So not really much help there. Your experiment yielded a little more help. Upon the recommendation of Mike(who made the suggestion before you told me Victor might have a special tap) i ordered a 1/4 x 34 tap that showed up a couple of days ago, i just havent had a chance to try it out. I will try it today and post my findings. If that tap doesnt work, i will try Victor again and maybe try the tap you suggested.
I will keep you informed.
Justin