Removing Overdrive Gear Knob

[samgamgee911]

Although I thought a simple task I have learn't that nothing is simple when it comes to my car. The gear knob has been tightened by a large green made in a bad mood or so it would seem. <br>
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The knob is held in place by a nut with 2 recesses at 180 degrees and is very tight. I looks as if someone has had a go with a nail punch in the past.<br>
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Is there a proper tool for the removal of this or has someone got a good idea on how to remove it without using a hacksaw?<br>
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Thanks in advance

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[Unknown]

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