>>> Just get a clutch (like the one in a car) that is controlled by a 
>>> third shaft rather than your foot.
>>
>> Does Lego have a part like that? ;-)
> 
> http://www.brickengineer.com/pages/2007/11/27/smooth-lego-clutch/

OK, so there's your clutch. Now, how to convert the rotational motion of 
an axial into the sliding motion to operate this clutch?

>> ...so instead of continuous rotational drive, you have continuous 
>> reciprocating drive, basically?
> 
> Yes basically, otherwise as you stated you can't transfer any power.

Right, OK. That could work...

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