The FW doesn't have the motor boss on the side of the machine. The Singer 66 & 99 some do and some do not have a motor boss on the side of the machine for the HC to attach... There are other machines that will HC. The Singer 319 will not - the hole does not line up square with the hand wheel. There are some Japanese 15s and some Singer 15s that will HC - again the motor boss has to be on the side and line up square. I'm thinking some people have built up the side on a FW and attached a HC - lot of work. The little window winder might work but it would be a lot of turning to do it. I have a Japanese deluxe type machine that will HC but is isn't much fun.