Hiho,
as stated above, the game completely crashes when i want to use either one of the wrenches. I uninstalled all of my mods and installd them one afer the other, and the Bud only appears when I add "Railcraft_Client_3.0.0_Core.zip", so I'm pretty sure that it's not a bug in IC2, but in Railcraft. However, the error log only mentions ic2, so I went here first, as CovertJaguar (Creator of Railcraft) will probably not know what to do with it.
...
java.lang.NoSuchMethodError: ic2.api.IWrenchable.wrenchCanSetFacing(Lxb;I)Z
at ic2.common.ItemToolWrench.onItemUseFirst(ItemToolWrench.java:81)
at acq.a(PlayerControllerSP.java:177)
at net.minecraft.client.Minecraft.c(SourceFile:1220)
at net.minecraft.client.Minecraft.k(SourceFile:1545)
at net.minecraft.client.Minecraft.x(SourceFile:709)
at net.minecraft.client.Minecraft.run(SourceFile:662)
at java.lang.Thread.run(Thread.java:636)
Stopping!
BTW: I't crashes regardless of whether I want to remove a machine or when I want to rearrange a battery block.
So, if you could tell me what CovertJaguar did wrong in Railcraft, I'm happy to tell him 