I was just wondering if anyone has information on a trip hammer made by a manufacturing company by the name of MacGowan & Finigan in ST Louis, patented sept 10, 1907. The hammer is named "Perfect", what I am looking for is some info on how it is stroked. I have one and the stroking mechanism looks like it has been put on afterwards and I would like to put it back to original. Any information or clue as to where to find info would be much appreciated. Thanks Claude