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Anyone _successfully_ rebuilt a Bosch mechanical metering unit

In message <VA.00000269.0175b98c@maximum-bhp.u-net.com> Chris Wilson writes:

> > I'm still trying to find a UK source for the proper rebuild kit including the 
> > diaphragm. 
> Presumably BR M/Sport can get them,so there must be a _way_ ...

No, they can't.  We cannibalised a head that was due to go back to Bosch for 
rebuilding.  The lower O-ring is identical to the upper one, but apparently 
doesn't wear so much - so we took the lower one out of another head.
But yesterday I found a Bosch fuel injection specialist who actually runs an ur-
quattro as a daily driver, and he's only fifteen miles away.

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