On 6/8/2011 6:59, Invisible wrote:
> As you can see, with the knob turned, you physically can't move the disk,
> because the knob is in the way.

And the heads were attached to the knob, yes. (Or at least lifted when you 
turned it.)

-- 
Darren New, San Diego CA, USA (PST)
   "Coding without comments is like
    driving without turn signals."

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