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I'm thinking of fitting a Dillon Roller Handle to a non-Dillon press - anyone have certain knowledge of the thread on the Dillon part where it goes into the press? As in maybe 5/8-18?
On the 550B, at least, the threads don't thread into the press cam, the handle just slides into a stepped hole, then a Nylock-style nut is threaded onto the threads to lock it at the angle you want it. HTH.