OK, I've run into an immediate problem with my "new"201: how to drop the feed dogs. The manual says something about swinging the machine back on its hinges: does that mean that the screws I need to get at are underneath the machine? I can't see how to get at them: the machine's set in its wooden base and seems to be screwed into it on the right hand side - those screws don't look as if they're going to be easy to shift, and anyway, the machine's so heavy that I doubt I have the strength to pull it free of the base. Or am I misunderstanding?