Diff case wheels?

Morning everybody.
Can anyone explain the purpose of the cast iron "wheels" mounted in the input sode of the diff cases please.

i dont understand which part you are talking about, could you explain a bit clearer please

He has been to the Sirus school of mechanical part discriptions

me thinks he may mean the counter balance weight that is mounted on the front diff

stig said:

me thinks he may mean the counter balance weight that is mounted on the front diff

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thas wot i wer thinkin but theres ony one o them ?????


PICCIES !

Thanks all. These wheels are about 75mm in diameter secured to the "cone" of the diff with a bolt through the centre. one on the front & one on the rear.
Sorry no pics today-pouring with rain. They may well be balance weights. Balancing what? You must realise by now that I am not an engineer, just a hobby tinkerer.