Okay, I swapped my spur hammer for a bobbed 3914 hammer in my 439/639 hybrid. My decocker no longer functions, but everything else is fine. Luckily I have a spare sear release lever, I put it in and the decocker now functions as intended but the lever is so high in the frame that the slide barely clears it Now for my questions, why does a hammer replacement change the position of the sear release lever and since the new lever rides so high in the frame so some fitting is in order, but where do I begin this process, as always any advice/input is appreciated.