Front subframe removal

[PHBJohns at aol.com]

Hi All,
I am trying to remove the front subframe of my 1983 quattro with a view to replacing the perished mounting bushes with a set of the Dialynx solid aluminium items (I've already succeeded in doing this at the rear). There appear to be a pair of torque reaction brackets that attach the differential casing to the subframe. Disconnecting the left side bracket which is attached via a large compliant bush is not a problem: it is the right side that is causing the headaches... There appears to be a 17mm bolt that passes from above through a hole in the bracket into what I have assumed is a captive nut in the subframe (there are two 13mm bolts screwed into the subframe either side of the baracket but I'm not sure what these are for...) Excessive torque was not required to slacken this 17mm bolt which was encouraging but my heart sank when having turned it through several revolutions, there was no sign of it coming out. It appears that the nut has de-captivated itself inside the subfram!
e. Have I missed anything? Is th
ere anything else I could try before I have to consider resorting to desparate measures (attacking the subframe with an angle grinder etc... )
Thanks very much,

Paul Johns (phbjohns at aol.com)
'83 Audi quattro
'65 Panhard 24CT
'74 Saab 96 etc