Extractor help can be found in the FAQs, see the simple extractor improvement, same for the misfires as I said before, there's lots of help there, just a matter of determining what the problem is, we can't do that for you, you'll have to work thru it a step at a time doing the easier stuff first that doesn't require replacing parts, but replacing the hammer spring with a Wolff extra power spring(FAQs) is a good place to start if you're gonna do surgery. H&R will also repair it which is always an option, you'd need to call H&R and get a repair authorization which is covered on the H&R website.
Tim