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Rear Girling caliper troubles --Conclusion

In message <4C4A9771494@enm.enm.maine.edu> "Kurt Wesseling" writes:

> As several of you suggested, the piston *does* indeed have to be 
> screwed or "spiraled" in (as Phil P. described it)
> There is also a 12 or 13 mm hex head fitting in the center of the 
> piston--in my case both of them were pretty well rounded out and 
> unusuable.

It's 12.  13mm doesn't exist - the size is not defined in the Allen 
specifications.  The large ones are 10, 12, 14, 17 and 19mm.

(Unless, of course, you've ever tried to get the injector seats out of an MB 
 engine.  Fortunately, "Beargrip" tools (Holland) haven't read the Allen 
 specifications and they actually manufacture a 13mm hex key and driver.)   

Personally, I believe there is no other tool where quality is so important.  
The very best quality Allen keys cost only a very few $$ more than a junk set, 
yet there are so many places where this kind of damage can be _very_ expensive.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club