I was on the hunt for a brass folding hammer today, and noticed that leatherworket.net user “Ferg” is in the process of listing a bunch of tools and supplies for sale. You can see his posts listed here:
Here’s his recent post with the first few shoe tools. A TINA feather plow. Some nippers. Lasting pliers. Folding hammer’s spoken for! 
In separate conversation, he offered a pair of Sorrell’s Munsons in 9½ EE, unused, for a very decent price. I understand he’s letting leather go, too.
I contacted him by private message on leatherworker.net. He responded the same day.
Nice! I would have grabbed that folding hammer had you not. Those seems fairly hard to find.
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Sorry if I sniped it from you!
My other lead on one was the supplier “Nanjing Precision Engineering Co., Ltd.” on Alibaba. A few of their listings are for general manufacturing availability, but use product photos, videos, and even photos of design drawings for the folding hammer as part of their “portolio” of possible products:
https://www.alibaba.com/product-detail/Turning-Services-Custom-Metal-Parts-CNC_60756431131.html
https://www.alibaba.com/product-detail/Turning-Services-Custom-Metal-Parts-CNC_60756431131.html
https://www.alibaba.com/product-detail/Custom-High-Precision-Brass-Forging-Components_60425862788.html
Haha, all good! That’s how the game goes.
I’ll check those out. In all honesty, I haven’t found a huge need for one, but it seems like a cool little tool to have.
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Honestly, the cooler option is probably just to find a scratch awl with a wide enough pommel and cut the blade short with a hacksaw. I’m sure the weight of brass or other metal could be nice, but I’ve done plenty of hammering with awl hafts sewing inseams.
Not a bad idea. The brass is neat for sure, but yeah, not totally necessary.