A wobble extension has a tapered semi ball shaped end on it where the socket 
attaches, this allows the socket to angle about 15-20 degrees for those times 
when you cannot get a straight shot at a bolt or nut. Similar idea as a 
knuckle or universal joint adapter but much more compact for those tight 
spaces.
Go here for a picture.
http://www.harborfreight.com/cpi/taf/DisplayItem.taf?ItemNumber=31203
 
In a message dated 7/4/99 9:39:25 PM Eastern Daylight Time, 
RobertDuquette@Sympatico.ca writes:
> > 2.  One set of wobble extensions.
>  ...
>  >  I can now do it in under 2 mins.
>  
>  
>  Dare I ask what a wobble extension is?
>  (seriously)
>  
 
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