The duplicate selection tool totally breaks block connections of the original selection and the new duplicate. Swivels and hinges disconnect and reattach to other things.
1. Get spaar's Mod Loader. (broken link) ---(If you have a BlockTransformTools.dll file in your mods directory remove it) 2. Open the .rar archive, if you can't you need an archiving software such as WinRAR 3. Drag the contents of the archive (.rar) into your Mods directory in the Besiege Directory.