I don't know what year your machine is but my old girl is a 1952. I let her sit for a couple of years and then she wouldn't budge! Hauled her around in the back of my car when it was 100+ degrees outside before taking her to the shop. To my surprise, upon arrival she worked just fine. The service man told me the internal lubrication was a thick grease type and had solidified....the heat melted it so the machine was fine. All I could think of was Crisco.....lol.