As far as I can see, Martin Hall's explanation about side bending isn't in the S&T book. Plummer and Bennet basically talks about tilting. Tilting and side bending isn't the same.
I watched their DVD's a couple weeks back, Bernt, and they mention it in their 2nd and 4th DVD. They mention a lot of things in those DVD's so it is very possible to miss their remarks imo.
ICT
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HP, grant me the serenity to accept what I cannot change, the courage to change what I can, and the wisdom to know the difference. Progress and not perfection is the goal every day!