I have seen something very similar to the lead discs before - in fact I have about 10 of them still on their mounting spindles, they are from the crash site of Defiant N3328 I will try to take some photos as I have a fair idea whereabouts in the workshop they are! As you say they are obviously some form of counterbalance, but when I showed them to representatives of the Boulton Paul Trust, they had never seen any before!
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