If it moves alittle it is a good thing and probably just needs to be oiled from sitting so long. Here is the link to the first tutorial.
http://www.quiltingboard.com/t-45816-1.htm
I would oil and let it sit for awhile. Wiggle the hand wheel and see if it moves some more. It may take a day or two. Or you can do the cleaning that is in the tutorial. It will work for the new machines also and would be the best in the long run for your machine to clean all the old stuff out. Don't be afraid, it is very easy to do. And Billy is the expert that you can get all kinds of support and help in the Vintage Machine shop post.