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ive used a Dremel tool with a grinding stone. most shifters taper WIDER as they go down (i dont have my car here to see). u need to grind down the diameter of the shaft to approx the original diameter of the original threads, grind evenly down about 1 inch (measure the outside edges of the original threads!!). get ur hands on a thread tapping kit (looks like a bunch of big nuts with sharp threads inside em and vertical grooves, each with different thread pitches, Sears sells the kit). if ur using the stock knob or a knob pre-threaded for Nissan, u need to know the size and pitch of the threads (i think the kit comes with a measuring tool..?) and choose the correct tap. OR if your aftermarket knob is universal and uses a plastic insert, just choose a size that fits tightly into the plastic insert! hope this helps. its actually easy....just labor intensive!
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