Picked up a 1929 Singer 99 at a garage sale today. The bentwood case needs some TLC and it runs a little klinky..sounds like an old fashioned cash register. I cleaned out a ton of packed lint around and under the bobbin case and oiled her up...next is to clean her up.. I'm seriously thinking about turning her into a handcrank.. I'm wondering if I do that will I still be able to use the bentwood cover if I do that?