1966 Dart Fuel Tank Sending Unit Lock Ring?

famous bob said

----------THJIS IS TRUE!!!!!!!!!!!! A blunt nosed flat punch would be the only thing I`d change .

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Another good tool choice Bob. The new tool linked above looks cool but I bet you will still have to use a hammer to break it loose and rotate it. Depending on how long the ring has been on the op's tank, it will probably be locked on and rusted in.