When ordering speed controls and stitch regulators be aware that there are more than one brand of machine that offer different end plugs. You have to order the correct one to fit your machine. Mine is a Janome and has a 3 prong plug in. Other machines may only have a 2 prong plug in. I know this because the order fom from Grace is very specific in asking. Call Grace and explain the situation, you will have to return the incorrect ones, to get the new one.