Hmm. Don't know - I just used native tools from Lightwave. Used Version 8 though, so if you're in an earlier version, then this might account for the error.
Essentially, the way I did this was to set the heirarchy so that bone (1) is the parent of all three other bones. You also might need to play around with bone weights and falloff too to prevent them affecting parts of the object that you want to remain static...
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