A system (100; 200), comprising: a housing of a medical device comprising a first connector block, the first connector block comprising a first feedthrough pin (106A-106J; 110A; 111A; 112A; 113A; 114A); a header comprising a lead port having a first electrical contact; and means for engaging the first feedthrough pin of the first connector block of the housing of the medical device with a proximate portion of a first preformed wire (107A-107D; 108A; 109A; 700) and physically separating a major portion of the first preformed wire from the first connector block and the housing when engaged with the first feedthrough pin, wherein the major portion of the first preformed wire is shaped to route a distal portion of the first preformed wire to the first electrical contact of the lead port of the header when the proximate portion of the first preformed wire engages the first feedthrough pin, characterized in that the means for engaging the first feedthrough pin of the first connector block of the housing of the medical device with the proximate portion of the first preformed wire and physically separating the major portion of the first preformed wire from the first connector block and the housing when engaged with the first feedthrough pin comprise a number of turns (107A 1, 107A 2, 107A 3; 108A 1, 108A 2) of the proximate portion of the first preformed wire, the number of turns shaped to engage the first feedthrough pin and to physically separate the major portion of the first preformed wire from the first connector block and the housing when the proximate portion of the first preformed wire engages the first feedthrough pin. a housing of a medical device comprising a first connector block, the first connector block comprising a first feedthrough pin (106A-106J; 110A; 111A; 112A; 113A; 114A); a header comprising a lead port having a first electrical contact; and means for engaging the first feedthrough pin of the first connector block of the housing of the medical device with a proximate portion of a first preformed wire (107A-107D; 108A; 109A; 700) and physically separating a major portion of the first preformed wire from the first connector block and the housing when engaged with the first feedthrough pin, wherein the major portion of the first preformed wire is shaped to route a distal portion of the first preformed wire to the first electrical contact of the lead port of the header when the proximate portion of the first preformed wire engages the first feedthrough pin, characterized in that the means for engaging the first feedthrough pin of the first connector block of the housing of the medical device with the proximate portion of the first preformed wire and physically separating the major portion of the first preformed wire from the first connector block and the housing when engaged with the first feedthrough pin comprise a number of turns (107A 1, 107A 2, 107A 3; 108A 1, 108A 2) of the proximate portion of the first preformed wire, the number of turns shaped to engage the first feedthrough pin and to physically separate the major portion of the first preformed wire from the first connector block and the housing when the proximate portion of the first preformed wire engages the first feedthrough pin.