Rolling pin sliders

Alan J.Birney fartwell2000 at y...
Sun May 2 20:45:00 BST 2004

Are any of these still in existance?
Also, I remember seeing somewhere a G+J hanging job that had a 
slider which consisted a rolling ball in a track- were these common 
at all?
I had no idea there were so many stay and slider arrangements.

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