Pete.
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- Kent, UK
I never saw one with a locking pad, but I always took the dual action to mean that it has a circular motion but is also free to rotate.
They are also called random orbital sanders, which is a pretty good description but too much of a mouthful so everyone just calls them 'DA'.
They are also called random orbital sanders, which is a pretty good description but too much of a mouthful so everyone just calls them 'DA'.