The sewing machine will either have a knee bar or a foot contoller to operate the machine. That would make a hole in the wood, under the large opening where you would sit, somewhere under there. It's either at the bottom, or the top right hand side. The picture you show looks to be a Domestic brand machine, in a Singer Cabinet. May not fit properly, and there will be a gap somwhere for a snake to get in. Also, look at the backside of the cabinet.