Program: 22398
Project: 22398
Buggy source:
private static void registerSteamToolUpgrades(){
  if (Config.enableBigDrill) {
    bigDrill=new ItemSteamToolUpgrade(SteamToolSlot.drillHead,"String_Node_Str","String_Node_Str",1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(bigDrill,"String_Node_Str");
  }
  if (Config.enableBattleDrill) {
    battleDrill=new ItemSteamToolUpgrade(SteamToolSlot.drillHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(battleDrill,"String_Node_Str");
  }
  if (Config.enableStoneGrinder) {
    stoneGrinder=new ItemSteamToolUpgrade(SteamToolSlot.drillHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(stoneGrinder,"String_Node_Str");
  }
  if (Config.enableLeafBlower) {
    leafBlower=new ItemSteamToolUpgrade(SteamToolSlot.sawHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(leafBlower,"String_Node_Str");
  }
  if (Config.enableCultivator) {
    cultivator=new ItemSteamToolUpgrade(SteamToolSlot.shovelHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(cultivator,"String_Node_Str");
  }
  if (Config.enableRotaryBlades) {
    rotaryBlades=new ItemSteamToolUpgrade(SteamToolSlot.shovelHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(rotaryBlades,"String_Node_Str");
  }
  if (Config.enableSifter) {
    sifter=new ItemSteamToolUpgrade(SteamToolSlot.shovelCore,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(sifter,"String_Node_Str");
  }
}

Fixed version (ground truth):
private static void registerSteamToolUpgrades(){
  if (Config.enableBigDrill) {
    bigDrill=new ItemSteamToolUpgrade(SteamToolSlot.drillHead,"String_Node_Str","String_Node_Str",1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(bigDrill,"String_Node_Str");
  }
  if (Config.enableBattleDrill) {
    battleDrill=new ItemSteamToolUpgrade(SteamToolSlot.drillHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(battleDrill,"String_Node_Str");
  }
  if (Config.enableStoneGrinder) {
    stoneGrinder=new ItemSteamToolUpgrade(SteamToolSlot.drillHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(stoneGrinder,"String_Node_Str");
  }
  if (Config.enableLeafBlower) {
    leafBlower=new ItemSteamToolUpgrade(SteamToolSlot.sawHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(leafBlower,"String_Node_Str");
  }
  if (Config.enableCultivator) {
    cultivator=new ItemSteamToolUpgrade(SteamToolSlot.shovelHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(cultivator,"String_Node_Str");
  }
  if (Config.enableRotaryBlades) {
    rotaryBlades=new ItemSteamToolUpgrade(SteamToolSlot.shovelHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(rotaryBlades,"String_Node_Str");
  }
  if (Config.enableSifter) {
    sifter=new ItemSteamToolUpgrade(SteamToolSlot.shovelCore,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(sifter,"String_Node_Str");
  }
  if (Config.enableGravityDigging) {
    gravityDigging=new ItemSteamToolUpgrade(SteamToolSlot.shovelHead,"String_Node_Str",null,1).setUnlocalizedName("String_Node_Str").setCreativeTab(Steamcraft.tabTools);
    GameRegistry.registerItem(gravityDigging,"String_Node_Str");
  }
}