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Does anyone know where to find a replacement part for an antique platform rocker?

I have an antique platform rocker that I need a replacement part for.  It is a cast iron arm at each end of a wood spindle.  Looking up online I found it may be called the "Lowentraut mechanism" and was designed in the late 1800's.  The rocker I have is in good shape but only has one of these cast iron arms and I am trying to find a way to get a 2nd one to complete the rocker and refinish it.  I am attaching a photo of the one arm that is on the rocker.  Any information on how to find a replacment part would be appreciated. 

Picture of Does anyone know where to find a replacement part for an antique platform rocker?
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I have a glider thats missing that exact same piece. Were you ever able to locate your part? voodoodaddy1168@yahoo.com
Start searching for a cast iron foundry and see if what it would cost for them to cast a replacement. They would probably have a to make a sand mold from the complete one you already have and it won't be cheap.