differential narrowing jig

clementine said

So you are sourcing the rod locally and then buying the ruler and plugs via the intertube....correct? or rather ebay and summit etc.etc

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Well, I actually ordered mine directly from Leadmine Products with a phone call several years ago, but he sells them on Ebay now. I bought the 1-1/4 rod from the local steel supplier. I know the guy there and asked him to give me a call when someone else wanted a partial stick.
I used to weld 'em up with no jig, similar to what Rusty describes, and never had one not run but the jig makes it easy to ensure all is good.