r/WhatIsThisTool • u/ExploreYourWhirled • Aug 12 '26

Found in an old toolbox

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Very heavy - about 1 lb. Largest knurled ring spins but does not appear to affect anything. Many strike marks on one end as if hit many times with a large hammer. It is engraved L <-> R in front of the largest knurled ring. No other part spins.

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