3/16" X 1/16" will fit right in the holes without having to drill out the socket of the plastic dreads. You might have to file a little of the arm stud off to make clearance, unless you get 1/32" thick magnets. Some people use 1/8" diameter magnets, but you have to make sure they're lined up right. You'll have to use the larger magnets for pewter arms. You will probably have to put in a pin to stabilize and pose the various arms so they won't fall down.
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