If your dealer says the #72 won’t work with your machine, I don’t know what you can do. You really need the ruler foot but........before they came out with the #72, I glued a little 1/4 inch round washer that exactly fit my darning foot circle to give me the extra thick foot. Did it work perfectly no but I did manage to use it. Sorry you can’t get the #72 because it works dandy.