I'll check that tonight.... I hate non adjustable 510's strange thing is it's working on half but not the others I including a Reo) didn't want to use it on there anyway - I reckon it's missing by a small fraction of a mm!
Thinking outside of the box... To test is there an way to shim for checking purposes that can be positioned inside the top of the 510... Something with a hole in to allow juice through just a very thin type washer minute in size?
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Bad idea.... If that washer touches the shell and the pin at the same time it's time for a new spring. Or much much worse.
Better idea: send that old Reo to Rob for the new adjustable 510 connection and worry no more.