Hello Jennifer, I have found two individuals in my gen file with the name John Swackhammer, but not sure with out a little more background information as to whether one of them might be your great grandfather. One was born in 1876 and the other was married about 1874, perhaps these individuals are one generation or two farther back. Have sent you an email with more specific data. Please feel free to write if you feel one of them connects. Kindest regards. Robert