That's why I won't buy a machine from shopgoodwill. If you're lucky enough to get a machine with all it's parts, that works as it should, etc....that's exactly what it is....LUCK! You're bidding on machines that are listed by people who know absolutely nothing about sewing machines....or packing them if it's going to be shipped.
I have bought on ebay. There are a few excellent ebay sellers who really know sewing machines...one who comes to mind is niftythriftygirl. She has a video of every machine that's listed, describes all flaws (& shows them on the video), & packs them so well they could be dropped from a roof! And there are a few others that are very trustworthy also...check feedbacks. You're protected as a buyer by ebay & Paypal....& the seller's fear of getting their feedback trashed!
I personally wouldn't buy anything on shopgw that takes some knowledge of the product to sell it properly.