Does anyone have any pics of Mk's chain diff please as the site only has 1 pic.

Cheers

May be of help, however not a very light weight option. Could reproduce in aluminium?
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Alternative
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just bear in mind when looking at the formula student/ formula sae cars that they are putting down about 80-90bhp and weigh about 250kg so the designs will need beefing up for a bigger car.