a plastic dust-cap tool comes with newer mavic wheel that has the same six hole pattern. I wonder if it is strong enough to work. They should be a dime a dozen in any modern road shop.
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear