I spoke with the gunsmith that worked on my contender yesterday. He took a multi pronged approach. He cleaned and polished(I think) the firing pin block. He said the spring was fine. He replaced the hammer and the hammer spring. 10 rounds test fired.
I told him that it may have fired 10 times before, and then misfired 3. It was an inconsistent problem. I hope the multi fix cures it.
