I am not a gunsmith but you should be able to go to Numrich Gun Parts and see a parts breakdown for the gun. I am guessing you have a broken or worn part in the inner workings that is not keeping the extractor where it belongs. I believe the system works on a cam which is, controlled, of course by the lever. The gun needs to be carefully disassembled to trouble-shoot it. If you search on Amazon and other areas of the internet you will find books on disassembly of rimfire rifles and I think the 72 is listed in one of those. Start searching the internet and keep googling the terms that might reward you....like disassembling the Savage 72. Often you-tube will have information and videos that are helpful.
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