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I'm looking to buy 2 1/2" dies for my Ridgid 4P threader. I see dies for other threaders, such as Toledo, going for much lower prices. I'm wondering if direct substitution or substitution with shims is possible. I don't want to try precision machining the dies. However, I can't seem to find the dimensions of the various manufacturers dies anywhere online. Does anyone know of a source? Just for the record the Ridgid 4P dies are ~621.5mils parallel to the threads and ~747.9mils perpendicular to the threads.