First open minecraft. Open texture pack folder and go to saves. Make a copy of that world. Blow up the compicated redstone on the copy deleate copt. Invite friends. Blow it up agian. Do it all over again. If you are having probles please comment to me with your problem and I will tell you how fix it. Bye and thanks for reading. :) Also watch my friend on youtube because he helps me build maps. He is Justa Bitofnotch.