@jitneyman: If you've specified and purchased a new extractor, then you are probably aware that your rifle is a re-branded Marlin Model 80. The model 80's are almost identical with the later model 780 series, which morph'd into the 880 series in the late 1980's.
The model 80 usually had a one piece collar extractor, which just snapped on and off. My 782 collar extractor has a small lip on one side which acts as a bolt guide. With one hand I press the extractor tine on that side, out of its slot, and then push upwards with the other hand on the small guide lip. It then just slips off.
Earlier model 80's had individual dual extractors, with a spring and extractor plunger. I've never worked with one of those, but on my other rifles and handguns with similar extractors, the extractor is typically removed by first pressing the extractor plunger back into it's recess with a small screwdriver, awl, or dental pick. While holding the plunger under tension, the extractor could then be un-hooked or pivoted off the bolt. The hazard, of course, is the possibility of the extractor plunger and spring slipping and flying off into the darkest recesses of the hobby room, workshop, or garage. If it does slip, rest assured that it will, of its own volition and free will, find the darkest and most inaccessible recess. Been there and done that.
