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I saw a post here about EDMing some holes in a custom made wrench. Here's another way to do it using a rotary broach tool holder. Rotary broaches can be made as a hex, square, spline, etc. http://www.youtube.com/watch?v=uTsPXFy7Xx0

Hello model engine makers. I work at a cutting tool shop, and love to look around at what everyone is making. It's good to see online that the art of making engines, model trains, and other historically important metalworking isn't gone. I've never built one myself (yet), but hope to offer some...