Is there a way to stop a part from rotating/moving while its welded to another rotating part? I don’t want to anchor it, because I still want the non-rotating part to move with the rotating part, but I don’t see any other solution apart from creating some sort of loop to keep the non-rotating part in the same position as the rotating part with an offset.
If you use an AlignPosition and AlignOrientation it could work.
If you place an Attachment offset in the first Part you can align the Position of the 2nd Part to that Attachment.
For the AlignOrientation put the Attachment in whatever Part you want the 2nd Part to align to.