I have Dave's book and DVD. Execellent for the DIY FW or 301 owner.
Any bit of thread or lint can get behind the bobbin case and jam it up, recommend unthreading unthreading, removing bobbin case, throat plate, looking for any lint or thread. Lubricate/oil if you didn't before starting to use (after 5 years!).
Running it full out applies after you fill the motor grease cups of they were dry. Once the lubricant (Singer Grease only) starts getting down into the motor you can hear it get smoother. (usually less than 5 minutes)