Every effort has been made to ensure accuracy, but mistakes do slip through. If something doesn’t work the way you expect, your first port of call should be www.friendsofed.com. A link to any known corrections since publication will be posted there.
If you think you have found a mistake that’s not listed, please submit an error report to www.friendsofed.com/errataSubmission.html. When friends of ED has finished with the thumbscrews and forced me to admit I’m wrong, we’ll post the details for everyone’s benefit on the friends of ED site.
What does the author allude to by the thumbscrews?