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Someone had their Imperial Knight magnetized at the hip but they could not remember the size of the magnet. any ideas on what size this is so I can get some for my knights?

I would suggest measuring that one.

The stump that is usually there on the Knight is 5mm wide, so my guess is the same as that?

looks like a 1mm x 5 or 6 mm round, I use it myself and its great for bigger joints, I suggest 1mm x 3 mm for smaller joints.