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many thanks guys it now makes sense i need a lathe dog and drive plate I knew some one would come through with the way to do itNigel
Nigel,Is this the plan?http://www.john-tom.com/MyPlans/Steam%20Engines/RotaryValveEngine.pdf
How do you take a piece of round stock and get the two sets of center holes aligned ??? I see for a rectangular piece it's no problem. ...lew...