Two blocks are often connected to each other by a Brace. When editing the mechanism, you need to move blocks that are already connected by Brace. After editing, one or both ends of the Brace may end up in a void, so the blocks will no longer be connected. To maintain the connection between the blocks, this Brace must be removed and a new one created, the ends of which will be located in the right places. My suggestion is that when you move the blocks, the associated ends of the Braces should also be moved. See a GIF.