Eddy,
Here are the details of the drive system. It operates on the K.I.S.S. principle. The MFA motor and 50:1 gearbox drive a pulley mounted on a 7/32 diam. shaft which in turn drives the two pitman arms which are 3/8 x 1/8 mild steel round edgeed flat bar. Some have said this is a little too beefy but I have tried using aluminium but this bends over a period of time and locks up the paddlewheel due to the quartering being out, I have also tried using Spruce but found it to vibrate a little,probably due to extreme light weight of the arms.
What material do you or any of the other members use?
Peter Webster (Land of Oz, where the temp today was a lovely 23 degrees0